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Mathematics Questions and Answers April 01, 2023

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The regression equation relating dexterity scores and productivity scores for the employees of a company is Productivity scores= 5.50 + 1.91 Dexterity scores The slope =______ The y-intercept =______________

TUTORIAL 4 Question 1 Suppose that you want to settle a dispute with your friend by tossing a coin. Unfortunately both of you do not carry any coin, but there happens to be a bottle cap on the floor. So you suggest to toss the bottle cap, and you both agree to call the event that it lands with the top facing up H, and the other event T.

Exams are approaching and Helen is allocating time to studying for exams. She feels that with the appropriate amount of studying, she has an 80% chance of getting an A in Marketing. She also feels that she has a 60% chance of getting an A in Spanish with the appropriate amount of studying. Given the demands on her time, she feels that she has only

Using the following information make a prediction fro y, given an x score of 8 Variable X: M=12, SD= 3 variable Y: M=74, SD= 18 Pearson correlation of variable x and y = 0.46 a. transform the raw score for the independent variable to a z score. b. calculate the predicted z score for the dependent variable. c.Transform the z score for the dependent

I am working with a confusion matrix. I have the cut-off value, along with the # of actual good and actual bad. How do I build the table in excel to calculate Type 1 Error and Type 2 Error? (i.e how do I use the cut off value to determine the false positives and false negatives?

Refer to the Buena School District bus data. Is there a difference in the mean maintenance cost for the diesel versus the gasoline buses? Use the .05 significance level.

Table of Contents As filed with the Securities and Exchange Commission on June 24, 2016 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F (Mark One) REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES

Explain the circumstances for which the interquartile range is the preferred measure of dispersion. What is an advantage that the standard deviation has over the interquartilerange? Choose the correct answer below. A. The interquartile range is preferred when the distribution is symmetric. An advantage of the standard deviation is that it

Find the probability of the given event. Choosing seven numbers that match seven randomly selected balls when the balls are numbered 1 through 38 . The probability of the give event =

PART A) 11 questions all together.... each file has a # on it For the standard normal distribution shown on the right. nd the probability of: ooourring in the indicated region. Clidc here to View page 1 of the standard normal table. Click here to View page 2 of the standard normal table. 0.67 The probability is (Round in four dedmal places as
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Suppose that each block of a hospital treats five different diagnoses. If ?=0.05, determine whether difference among the treatment and block effects are significant. \f
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A machine that produces a special type of transistor (a component of computers) has a 4% defective rate. The production is considered a random process where each transistor is independent of the others. (a) What is the probability that the 10th transistor produced is the rst with a defect? (Round your answer to four decimal places.) (b) What is

A bowler's scores for a sample of six games were 172 168 188 190 172 182 174 Refer to Exhibit 3-3. The bowler's modal score is:

Caffein IQ e Dose Scor e 50 60 100 Assignment 102 View SPSS for Beginners 4: Regression located at http://www.youtube.com/watch?v=JVwEdhEiGJg. Open SPSS and complete the following: 80 107 90 105 110 112 150 108 150 103 1. Obtain an output with a simple linear regression and a scatterplot graph (as in the tutorial) using the values as seen below.

Jane MacFarlane wants a weekly schedule for two business services, X and Y. Each unit of X delivered to customers needs one service package, while each unit of Y uses two of the packages, and Jane has a maximum of 80 packages available a week. Each unit of X and Y needs 10 hours of subcontracted work, and Jane has signed agreements with

IE 3301-001 FALL 2017 PROJECT PART I Due Wednesday, November 15, 2017 There will be two parts of the project. Each part is worth 5% of your semester grade. The overall aim of the project is to allow students to apply some of the important concepts learned in IE 3301 to the analysis of real world data. The specific objectives are: To sample data

The plot in the previous exercise seems to indicate that bank size does influence the relationship between wages and length of service. Do separate regressions of wages on length of service for large banks ( n = 34) and for small banks ( n = 25). Give the equation of the regression line of wages on length of service for large banks. Give your

I need help with the attached question. 1. Saunders Railway Company handles large coal shipments.On April 13 th , the company had empty coal cars at the following locations in the quantities indicated: Morgantownsupply of cars:35 Youngstownsupply of cars:60 Pittsburghsupply of cars:25 By April 16 th the following towns need coal cars delivered:
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The lifetime of a disk drive head is normally distributed with a population mean of 1000 hours and a standard deviation of 120 hours. Determine the probability that the average lifetime for 16 disk drives will exceed 940 hours.

you will simulate 1000, 2000, 5000, and 10000 samples from a normal population with and and comment on the effect of number of samples on the standard deviation of the sample means. Use sample size 30 in each case. First compute for before completing the following table. Number of Samples Mean of Sample Means Standard Deviation of Sample Means

I need the TI 83 process for this equation, step by step on entering data. nCr = n!/(n-r)!r! I did the following using alternative format, but need steps to enter to calculate same results: 45C10 = 45!/(45-10)!(10!) = 319,018,729 15C3 = 15!/(15-3)!(3!) = 455 30C7 = 30!/(30-7)!(7!) = 2,035,800 Taking 455 (15C3) * 2,035,800 (30C7) = 9,626,289,000

Compute the critical value z Subscript alpha divided by 2 that corresponds to a 93 % level of confidence. Having trouble with my statistics homework.

You are engaged in an argument over whether HRBT traffic is worse than Capital Beltway traffic.Suppose the null hypothesis is "HRBT traffic is worse than Capital Beltway traffic".State each type of error in sentence form: a. Type I b. Type II

Hello. I am in need of a step by step approach to calculate the following questions in order that I can apply the approach/logic to similar questions. The amount of glue a machine pours into bottles has a mean of 50 ounces with a standard deviation of 0.25 ounces. We take a random sample of 36 bottles filled by this machine. True or False the

The mean legnth for imprisonment for motor vehicle theft offenders in the us is 16.7 months with a population sd of 6.0 months prison term legnths are normally distributed A) what % of offenders that spend between 8 to 12 months in prison for motor theft ? B) what percent of offenders spend >18months in prison? C) what % of offenders spend D) what
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Consider a biochemical reaction in which a certain substance is both produced and consumed. The concentration of this substance at time t is defined to be c(t). Assume that the function c obeys the following differential equation: dc/dt = Kmax (c / k + c) rc Where Kmax, k, and r are all positive constants. The first term on the right hand side of

If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, approximately what percentage of light bulbs has a life of more than 3000 hours? A. About 84% B. About 68% C. About 32% D. About 16%

1.A popular blog reports that 60% of college students log in to Facebook on a daily basis. The Dean of Students at a certain University thinks that the proportion may be different at her university. She polls a simple random sample of 205 students, and 134 of them report that they log into Facebook daily. Can you conclude that the proportion of

Use Newton's method to find the location of the local minima of the following function. (Round your answer to three decimal places.) minimum of f ( x ) = x 2 +6 x + 1 \f
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A die with 6 sides is rolled. What is the probability of rolling a number less than 5? A. one sixth (fraction) B. five sixths( fraction) C. two thirds (fraction) D. 4

Let random variable x represent the number of girls in a family of three children. (a) Construct a table describing the probability distribution. (b) Determine the mean and standard deviation of x. (Round the answer to two decimal places)

Movie Title American Sniper The Hunger Games: Mockingjay - Part 1 Guardians of the Galaxy Captain America: The Winter Soldier The LEGO Movie The Hobbit: The Battle of the Five Armies Transformers: Age of Extinction Maleficent X-Men: Days of Future Past Big Hero 6 Studio Warner Brothers Lionsgate Buena Vista Buena Vista Warner Brothers Warner

Homework Assignment 8 Due in Week 9 and worth 30 points Suppose the number of equipment sales and service contracts that a store sold during the last six (6) months for treadmills and exercise bikes was as follows: Treadmill Exercise Bike Total sold 185 123 Service contracts 67 55 The store can only sell a service contract on a new piece of

IQ Scores Frequency Cumulative Frequency 50-69 23 70-80 249 90-109 0.722 110-129 130-149 25 Total 1000 The frequency distribution below shows the distribution for IQ scores for a random sample of 1000 adults. (Show all work. Just the answer, without supporting work, will receive no credit.) (a) Complete the frequency table with frequency and

Dichotomize the variable "Price" at its 75th percentile and call this new variable "HighPrice". Please note that you will not replace the "Price" variable but set new variable "HighPrice" using XLMiner. How to do it? Price 16900 21500 12950 19950 19600 21500 22500 22000 17950 16750 16950 15950 15950 15950 15750 12950 15750 15950 15500 15750 15950

Feature movie lengths (in hours) were measured for all movies shown in the past year in the U.S. The mean length of all feature length movies shown was 1.80 hours with a standard deviation of 0.15 hours. Suppose the length of a random sample of 20 movies was recorded from all movies released this year. The mean length of the feature length movies

Compute the critical value z/2 that corresponds to a 91 % level of confidence.

find the percent of the area under a normal curve between the mean and the given number of standard deviations from the mean a. .93 b. -1.45 c. .37

CS 5.1 3.5 2.4 4 1.7 2 5 3.2 5.2 4.3 2.9 1.1 2.6 4 5.3 4.9 5 3.9 SE 4 4 2 6 2 2 4 2 6 6 2 2 4 6 4 6 6 4 Profit 2 3.5 8.5 4.5 7 7 2 5 8 5 6 7.5 4 4 1 5 6.5 1.5 APL 15.57 44.02 20.42 18.74 29.2 44.92 55.48 59.28 94.39 128.02 96 131.42 127.21 252.9 409.2 463.7 510.22 XE OBD 2463 472.92 2048 1339.75 3940 620.25 6505 568.33 5723 1497.6 11520 1365.83

1) Using a random sample of 100 workers, researchers calculate a 95% confidence interval for the average hourly wage earned by construction workers in the city of Boston. This interval they calculate is from $18 to $26. Does this mean we can say that roughly 95% of construction workers in the city earn hourly wages between $18 and $26? A) We

Medicare/Medicaid Blue Cross/Blue Shield Universal Health 64 69 96 22 64 55 59 68 65 85 48 50 34 48 37 87 27 48 70 84 43 45 107 63 72 63 39 67 59 89 75 73 28 94 4 33 54 91 65 85 59 89 78 54 95 58 87 77 75 60 49 66 78 46 57 42 77 85 53 76 24 83 69 47 51 57 71 72 20 60 59 58 64 76 85 50 74 77 57 41 59 66 20 41 80 91 92 50 56 54 33 20 57 49 77 29 44

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Hi there could you help me with this problem? the following problem related to the network flow problem and graph theory problem \f
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Why is the standard normal curve sometimes referred to as the z-curve?

Park University MA120 Can someone help me with this question? True or False: The mean of a normal distribution has no effect on its shape. Explain your answer.?

M7_IND4. Andre Greipel is the owner of a small company that produces heart rate monitors. The annual demand is for 2,800 heart rate monitors, and Andre produces these devices in batches. On average, Andre can produce 150 monitors per day during the production process. Demand for monitors has been about 50 monitors per day. The cost to set up the

3-4 sentences per questions only, please! 1. Name an example of a real-world data set, not yet mentioned in the course, where you would typically expect to see a normal distribution. Be sure to describe what the labels would be for the horizontal and vertical axis of the display. Then explain why you would expect a normal distribution. What range

Suppose you randomly draw two marbles, without replacement from a bag containing 6 green, 4 red and3 black 19. Suppose you fandomly draw two marbles marbles a) Draw a tree diagram to illustrate all possible outcomes of this draw b) Determine the probability that both marbles are red c) Determine the probability that you pick at least one grcen

A biostatistician is investigating the time, T, to death of a mouse exposed to a newly developed pesticide. He nds that the pdf of T is given by the following formula f(t) = 15t2e????5t3 . Which of the following statements best describes the value of the pdf evaluated at t = :5; that is, f(:5)? Justify your answer. A. f(:5) is the median time to

If A and B are mutually exclusive events with P(A) = 0.2 and P(B) = 0.6, then P(A or B) = _____.

3.4 In triathlons, it is common for racers to be placed into age and gender groups. Friends Leo and Mary both completed the Hermosa Beach Triathlon, where Leo competed in the Men, Ages 30 - 34 group while Mary competed in the Women, Ages 25 - 29 group. Leo completed the race in 1:22:28 (4948 seconds), while Mary completed the race in 1:31:53 (5513

A population of wolves grows exponentially at a rate of 4.9 4.9 percent per year. The population was 2600 2600 in 2000. Step 2 of 3:What will the population be in the year 2012? Round up to the nearest whole animal.

#1 On Your Own DATA Child's Age Group 2 to 3 4 to 5 Mothers Age Group 18-27 6.00 7.00 8.00 6.00 7.00 8.00 6.00 6.00 7.00 8.00 6.00 10.00 9.00 10.00 9.00 10.00 9.00 9.00 10.00 9.00 9.00 10.00 11.00 9.00 10.00 11.00 7.00 3.00 3.00 3.00 14.00 2.00 14.00 2.00 14.00 14.00 2.00 28-35 9.00 9.00 9.00 9.00 9.00 9.00 10.00 9.00 10.00 9.00 10.00 9.00 10.00

Marine scientists categorize signature whistles of bottlenose dolphins by type type a, typeb, typec, etc. In one study of a sample of 185 whistles emitted from bottlenose dolphins incaptivity, 1 00 were categorized as type a whistles. Estimate the true proportion of bottlenose dolphin signature whistles that are type a whistles. Use a 9 9 %

a car that weighs 1900 lbs is driving on dry roads at 40mph. The driver brakes without stopping. What is the force of friction.? What is the cars rate of acceleration? \f\f
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A study of college football games shows that the number of holding penalties assessed has a mean of 2.3 penalties per game and a standard deviation of 0.8 penalties per game. What is the probability that, for a sample of 40 college games to be played next week, the mean number of holding penalties will be 2.15 penalties per game or less? Carry

In 2004, the General Social Survey (which uses a method similar to simple random sampling) asked, "Do you consider yourself athletic?" For this question, 255 people said that they did out of 2373 randomly selected people. What is the 95% confidence interval for the proportion of all Americans who consider themselves athletic? a.(0.095, 0.120)

Lab 10 We will explore 95% confidence interval estimation of a population mean using the t- confidence interval as discussed in Section 11.2 of the text. I. You will be asked to generate 10 random samples of size n = 5 from a skewed distribution and use Minitab to calculate the t-interval estimate of based on each of the ten random samples. You

A company in Maryland has developed a device that can be attached to car engines, which it believes will increase the milage per gallon \f
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A random sample of 35 gas grills has a mean price of$631.20. Assume the population standard deviation is$56.50. You are given the sample mean and the population standard deviation. Use this information to complete the following. a. Construct the90% confidence interval for the population mean. b. Construct the95% confidence interval for the

To estimate the population mean SAT math score of freshmen at a certain university, a simple random sample of 100 freshmen was taken. The sample yielded a 90% confidence interval of 458+-30. What is the margin of error?

Use the product rule to find the derivative. y=(5x^2+3)(4x-3) y'=____________

Please show all work on how to solve the following question. Thank you. ? Cunsidar the folluwing. .'r' _||||||_ y=ftxl x 4 E5 Ea? Bf midi? values from the given gmph off. use ve redangla 11) nd a lmr Etimata fur the area under the given glaph nfffmrn x - 0 in x - 10. {Raul-Id youranswer to nine decimal place.) \fO readi valu from the gin-an graph
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A student researcher compares the heights of men and women from the student body of a certain college in order to estimate the difference in their mean heights. A random sample of 11 men had a mean height of 67.9 inches with a standard deviation of 2.95 inches. A random sample of 17 women had a mean height of 62.9 inches with a standard deviation

1.In 2011, Brand A MP3 Players had 45% of the market, Brand B had 35%, and Brand C had 20%. This year the makers of brand C launched a heavy advertising campaign. A random sample of electronic stores shows that of 10,000 MP3 Players sold, 4,350 were Brand A , 3,450 were Brand B , and 2,200 were Brand C . Has the market changed? Test at a = 0.01.

Please work this question out. A researcher investigates whether classical music is more or less soothing to air-traffic controllers than modern music. She plays a classical selection to one group and a modern selection to another. She gives each person an irritability questionnaire and obtains the following: Classical: Modern: (a) Subtracting C -

If there is a strongcorrelation(r>0.9)betweentwo variables(X and Y)then there must be a causation.That is,either X causes Y or Y causes X.

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SET 4 1. In a group of people, some are in favor of a tax increase on rich people to reduce the federal deficit and others are against it. Three persons are selected at random from this group and their opinions in favor or against raising such taxes are noted. How many total outcomes are possible? Write these outcomes in a sample space S. Draw a

A factory supervisor is concerned that the time it takes workers to figure out an important production task (measured in seconds) is too erratic and adversely affects expected profits. The supervisor proceeds by randomly sampling 5 individuals per hour for a period of 10 hours. The sample mean and range for each hour are below. _ Hour X R 1 18.4

The Falling Snow Company is considering production of a lighted world globe that the company would price at a markup of 0.25 above full cost. Management estimates that the variable cost of the globe will be $62 per unit and fixed costs per year will be $240,000. Assuming sales of 1,200 units, what is the full selling price of a globe with a

While the overall redemption rate of Sudzo coupons was only 35%, the rate was 45% among middle income families, 25% among low income families, and only 5% among high income families.If she conducts this promotion, Schultz would, as in past promotions, mail 60% of all coupons to middle income families, 30% to low income families, and the remaining

The question asks to draw a directed graphical model for the following factorized distributions. I need to use plate notation for this problem and I'm not sure about how to go about that. \f
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The time spent waiting in the line is approximately normally distributed. The mean waiting time is 7 minutes and the variance of the waiting time is 1 . Find the probability that a person will wait for more than 5 minutes. Round your answer to four decimal places.

1. In a drawer, I have five batteries three that work and two that do not work. If I grab three batteries, what is the probability that only one works. 2. . You are provided with the following information P(A) = 0.3, P(B) = 0.2, P (A OR B) = 0.44 and that the events are independent. What is P (A | B)? A school offered blood pressure screening for

In a study of pancreatic cancer and consumption of soy products, we observe an odds ratio of 5.5. However, we suspect that body mass index (BMI) may confound this association. For BMI to be a confounder, which of the following are required BMI must be evenly distributed between the exposed and the nonexposed. BMI must be associated with both

The following table lists the value of ice cream sales, the population (which varies because of tourism) and the temperature in the tourist town of Sorriento each week during the summer of 2015. Ice Cream Sales (IC) 37,268 37,092 37,157 37,246 37,346 37,351 37,298 37,215 37,104 36,141 36,539 36,927 36,974 36,484 35,993 37,027 36,998 35,912 35,988

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=3x^2, x:1, y:0, about the x-axis

You can rent a car for the day from Company A for $26 plus $0.12 a mile. Company B charges $24.00 plus $0.19 a mile. Find the number of miles m (to the nearest mile) per day for which it is cheaper to rent from Company A. more than 29 miles more than 161 miles less than 161 miles

This week's homework is based on the following article. Please answer the questions using the information given in this abstract and in the table. Assume that =0.05. BACKGROUND. It is uncertain whether treatment of mild gestational diabetes mellitus improves pregnancy outcomes. METHODS. Women who were in the 24th to 31st week of gestation and who

I am having some issues with statistics if anyone could help me figure out how to find the critical value of a two sided tail test. If you could help with steps using STATCRUNCH that would be great. Thank you! the question is Conduct the following test at the alphaequals= 0.050.05 level of significance by determining (a) the null and alternative

Table 1. Distribution of Variable Grade Score Frequency Percent Cumulative Frequency Cumulative Percent 0-9 4 10-19 8 20-29 8 30-39 2 40-49 4 50-59 5 60-69 7 70-79 4 80-89 3 90-99 5 Total: What is the total number of cases in this table? What is the frequency of 70-79? What percentage of the cases scored 80-89? What is the cumulative frequency of

The computer systems Department has 8 faculty, 6 of whom are tenured. Dr. Vonder, the chair wants to establish a committee of 3 departments of faculty members to review the curriculum. If she selects the committee at random: a What is the probability all members of the committee are tenured? What is the probability that at least one member is not

A study was designed to test whether applying metal tags is detrimental to a penguin. One variable examined is the survival rate 10 years after tagging. The scientists observed that 10 of the 50 metal tagged penguins survived, compared to 18 of the 50 electronic tagged penguins. Construct a 90% confidence interval for the difference in proportion

Please answer all parts of the following question (you must use Caclulus concepts learned and show all work): 1. Lumyn Electronics has seen stellar expansion in recent months. The company's profit, P, is currently growing exponentially at 5% each year. The rate of change of the company's profit can be modeled as 1/ P dP =0.05 dt. Find a general

Suppose that the New England Colonials baseball team is equally likely to win a game as not to win it. If 4 Colonials games are chosen at random, what is the probability that exactly 2 of those games are won by the Colonials?Round your response to at least three decimal places.

A plant physiologist is planning to measure the stem lengths of soybean plants after two weeks of growth using a new fertilizer. Previous experiments suggest that the standard deviation is 1.3 cm. Using this as a guess for , determine how many soybean plants the researcher should have if she wants the standard error to be no more than 0.2 cm. Note

c10Exploration_10.4.indd Page 245 7/23/15 10:13 PM f-w-204a /201/WB01616/9781118335888/ch10/text_s Save Print EX P LO RAT IO N 10.4: Perceptions of Heaviness Perceptions of Heaviness EXPLORATION Researchers believe a person's body is used as a perceptual ruler and people will judge the size of an object based on its relationship to parts of their

1 Module Six Worksheet In this worksheet activity, analyze the conclusions reached by the researchers in your final project article and compare them to the conclusions of the corresponding Reference Article from the provided list. Explain how the study you have analyzed contributes to scientific literature and speculate about further

The following data are the distances between 20 retail storesand itslarge distribution center. The distances are in miles. 29; 37; 38; 40; 58; 67; 68; 69; 76; 86; 87; 95; 96; 96; 99; 106; 112; 127; 145; 150 1. Use your calculator and the abovedata to find: mean median mode standard deviation outliers 2. State the best measure of center to use when

1.)A New York Times article reported a study that investigated whether giving flu shots to schoolchildren protects a whole community from the disease. Researchers in Canada recruited 49 remote Hutterite farming colonies in western Canada for the study. In 25 of the colonies, all children aged 3 to 15 received flu shots in late 2008; in the 24

I need help answering these questions ASAP please thank you in advance 11 The number of bags arriving on the baggage claim conveyor belt in a 3 minute time period would best be modeled with the C Poisson distribution A binomial distribution A exponential distribution C\"; hypergeometric distribution C\"; hyperbinomial distribution 12 Life tests
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Consider the following function: f(x) = 6 x^2 -10x +8 +ln(x) Find all possible inflection points in (x, f(x) ) form. Write the answer in its simplest form or as a decimal rounded to the nearest thousandth. (If necessary, separate your answers with commas.)

Classify each of the following random variables as discrete or continuous. a) The time left on a parking meter b) The number of bats broken by a major league baseball team in a season c) the number of cars in a parking lot at a given time d) The price of a car e) The number of cars crossing a bridge on a given day f) The time spent by a physician

Please answer all parts of the question and show your work so I am able to see how to do each part I am stuck on this question. Thank you!!!! As part of the study on ongoing fright symptoms due to exposure to horror movies at a young age, the following table was presented to describe the lasting impact these movies have had during bedtime and

10. Mimi just started her tennis class three weeks ago. On average, she is able to return 20% of her opponents serves. Assume her opponent serves 8 times. (a)Let X be the number of the serves that Mimi returns. As we know, the distribution of X is a binomial probability distribution. What is the number of trials (n), probability of successes (p)

An Air Force study indicates that the probability of a disaster such as the January 28th,1986 explosion of the space shuttle Challenger was 1 in 35. The Challenger was the 25th mission. How many disasters would you expect in the first 25 flights? Use the normal approximation to estimate the probability of at least 1 disaster in 25

Exhibit 1-3 In order to estimate the amount of TV watched by New York City adults, a sociologist surveys a random sample of adults from this city. Refer to Exhibit 1-3. The average (mean) of the raw scores is a ____.

Hello, i got two multiple choices wrong. I need help with these. For the first picture, i chose B and C. For the last one, i chose B. But they are wrong. I need explanations. Thanks. (1 point) Refer to the previous question, the physics student used the regression model to make a prediction: in order to stretch the spring by 15cm, the force
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