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Mathematics Questions and Answers March 30, 2023

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Problem 1. Find the arc length of intersection of the parabolic cylinder x^2 = 2y and the surface 3z = xy from the origin to the point (6, 18, 36) Problem 2. (a) Compute curvature of r = sin 3 for [0, /3]. (b) At which point does the curve y = 9 log x have maximum curvature? What happens to curvature as x ? (c) Find an equation of a parabola that

1)The following is a discrete probability distribution of cars sold daily at Mt. Olympic Used Car Sales. What is the average number of cars sold at this company each day? XCars Sold 0 1 2 3 4 P(X) Cars Sold 0.05 0.05 0.6 0.2 0.1 A.1.25 B.2.00 C.2.25 D.3.75 2)10% of the computer parts from Cheap Cheap Cheap computer supplier are defective. What is

Rabbits like to eat the cucumbers in Mimi's garden. There are 12 cucumbers in her garden which will be ready to harvest in about 10 days. Based on her experience, the probability of a cucumber being eaten by the rabbits before harvest is 0.30. (a) Let X be the number of cucumbers that Mimi harvests (that is, the number of cucumbers not eaten by

mark Perception Develop an experimental research scenario where you could use either a one-sample or two-sample t-test or a one-way analysis of variance to analyze the data and reach a conclusion about the research question posed in the example. Do your work in a word processing document and paste answers into the exam text boxes as plain text,

Skitzy Schizophrenic at the American Medical Association wrote a report recently that stated the average annual salary of psychiatrists is $189,121with a population standard deviation of $26,975 (= 26975).A group of hospital administrators in the Northeast randomly sampled 64 psychiatrists (n = 64) and found an average annual salary of $196,430

Statistics 252 - Homework # 4 Questions - Fall 2017 STAT 252 Homework 4 Questions (58 marks) - Due Wednesday, November 29 by 10 pm For questions that state \"SHOW ALL STEPS\

GRAPH 1 GRAPH 2 Items Sold Items Sold Week Number Week Number

Use the approximatehalf-life formula for the case described below. Discuss whether the formula is valid for the case described. Urban encroachment is causing the area of a forest to decline at the rate of 6 % per year. What is thehalf-life of theforest? What fraction of the forest will remain in 10 years?

Question 9 Suppose that prior to conducting a coin-flipping experiment, we suspect that the coin is fair. How many times would we have to flip the coin in order to obtain a 90% confidence interval of width of at most .18 for the probability of flipping a head? a) 83 b) 84 c) 87 d) 50 e) 51 f) None of the above Question 10 It has been observed that

1.Given the following information, would your decision be to reject or fail to reject the null hypothesis? Setting the level of significance at .05 for decision making, provide an explanation for your conclusion. a.The null hypothesis that there is no relationship between the type of music a person listens to and his crime rate ( p = .06). b.The

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1) A genetic experiment involving peas yielded one sample of offspring consisting of 438 green peas and 166 yellow peas. Use a 0.05 significance level to test the claim that under the same circumstances, 27 % of offspring peas will be yellow. Identify the null hypothesis, alternative hypothesis, test statistic, P-value, conclusion about the null

1.3) Hello i need assistance with questions that need to be answered ASAP. I am adding a screenshot of the question. Thank you! 44% of men consider Themselves professional baseball fans. You randomly select 10 men and ask each if he considers himself a professional baseball fan. Find The probability that The number who consider themselves baseball
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Area Gas Prices - Random Sample Minneapolis Price of Regular Station Unleaded 1 $3.24 2 $3.03 3 $3.63 4 $3.58 5 $2.94 6 $3.68 7 $3.14 8 $3.36 9 $3.40 10 $3.20 11 $2.85 12 $3.80 13 $3.31 14 $3.78 15 $3.43 16 $3.27 17 $3.18 18 $3.48 19 $3.00 20 $3.36 21 $3.52 22 $3.26 23 $3.04 24 $3.17 25 $3.26 26 $3.27 27 $3.30 28 $3.51 29 $3.80 30 $3.05 31 $3.56

Allied Freight Input data Unit shipping costs From Warehouse 1 Warehouse2 To Customer 1 Customer 2 Customer 3 $15 $35 $25 $10 $30 $40 Shipping plan and constraints on demand and supply To Region 1 Region 2 Region 3 Total shipped From Warehouse 1 0 10 30 40 Warehouse 2 30 0 0 30 Total Received 30 10 30

loncapaOZpurdue.edu in a certain metropolitan area, the population is approximated by the function: 7272e-5' 1 + x P(x, t) = where x Is the number of miles from the center of the city, and 1 Is the number of years after the year 2000. What Is the average value of the populatlon over the rst 8 years within a radius of 3 miles from the city center?
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In a cohort study the risk ration for COPD for moderate smokers versus non-smokers was 3.0. For heavy smokers compared to non-smokers, the risk ration was 9.0. a) What would the risk ratio be for non-smokers, if heavy smokers were the reference category (2 decimal places)? b) What would the risk ration be for moderate smokers, if heavy smokers

Car Age (years) Selling Price ($000) 1 12 10.3 2 10 9.2 3 15 4.6 4 18 4.2 5 12 5.1 6 10 11.6 7 12 8 8 16 7.8 9 14 7.8 10 18 4.3 11 8 10 12 8 8.8

1) Theactualvaluesfor12periods(showninorder)are: (1)45(2)52(3)48(4)59(5)55(6)54(7)64(8)59(9)72(10)66(11)64(12)78 Using a 5 period simple moving average, the forecast for period 13 will be: 2) Using the 4 period weighted moving average, the forecast for period 13 will be: 3) With exponential smoothing, the forecast for period 13 will be: 4) With

Suppose you have a distribution, X, with mean = 10 and standard deviation = 3. Define a new random variable Y = 5X - 5. Find the mean and standard deviation of Y.

BRIDE'S magazine reported that the mean cost of a wedding is $20,000. Assume that the population standard deviation is $9400. BRIDE'S plans to use an annual survey to monitor the cost of a wedding. Use 95% confidence. What is the recommended sample size if the desired margin of error is $600?

Q1. Statistically speaking, we are generally agnostic to which is a bigger problem, type I (false positive) errors or type II (false negative) errors. However, in certain circumstances it may be important to try and put more emphasis on avoiding one or the other. Can you think of an example of where you may want to try harder to avoid one type or

GPA\tACT\tX2 3.897\t21\t0 3.885\t14\t1 3.778\t28\t0 2.54\t22\t1 3.028\t21\t0 3.865\t31\t0 2.962\t32\t0 3.961\t27\t1 0.5\t29\t0 3.178\t26\t1 3.31\t24\t0 3.538\t30\t1 3.083\t24\t1 3.013\t24\t1 3.245\t33\t0 2.963\t27\t0 3.522\t25\t1 3.013\t31\t1 2.947\t25\t1 2.118\t20\t1 2.563\t24\t1 3.357\t21\t1 3.731\t28\t0 3.925\t27\t1 3.556\t28\t0 3.101\t26\t1

How do you code a Right hemicolectomy using PCS? I don't know how to code this

1.You are about to drive to your cottage. If your cars engine is out of tune, your gas cost will increase by 100. Having the engine tested will cost $20. If it is out of tune repairs will cost $60. Before testing, the probability is 30% that the engine is out of tune. What should you do?

Question: Use the data from the table containing weekly payrolls for two imaginary restaurants to create parallel box plots using Excel or StatCrunch.Then give statistical reasoning to tell which restaurant you would rather work for. So this is what i did did i do it correct? if yes, please explain to me why statistically which restaurant you
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Your help is greatly appreciated! Thank you for your time. (1 point) The contours of a function f are shown in the figure below. For each of the points shown, indicate whether you think it is a local maximum, local minimum, saddle point, or none of these. (a) Point P is ? c (1)) Point O is ? (0) Point R is ? {P (d) Point S is ? 4P
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hi, can anyone help me with this question? which answer is correct? In multiple regressien, the residual plet ef the residuals 1tiersus predicted 1tralues can he used In I] determine if there are eutliers. ll] eheelt the eenditien that the residuals have eenstant variati en. III] eheel: the epnditien that the residuals are nerrnally distributed.
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If an Expected Value of an Estimator equals the parameter that its estimating, then the Estimator is?

Find the equation of the line tangent to the curve: xy^3+xy=10 at the point(5,1). When the equation of this tangent line is written in the formy=mx+b, m= b=

Suppose a cancer has an incidence throughout a cohort of 1/1000.A screening test for that cancer has a false positive rate of 20% and a 0 false negative rate.The first time you take the test you test positive.The second time you also test positive.Assuming each false positive test result is independent of past false positive test results, what is

The IRS reports that the mean refund for a particular group of taxpayers was $1,600. The distribution of tax refunds follows a normal distribution with a standard deviation of $850. a. What percentage of the refund are between $1,800 and $2,000?

The standard error of the mean is the standard deviation of the sample selected T minus F and why and why not I put you have to calculate an estimate for standard error of mean from standard diversion of your sample so it would not is that right

researched on the internet, about the challenges of public opinion (polling) surveys. As a problem statement, recall that almost every polling survey taken in September and October of 2016 said Hillary Clinton would win the election, but a few weeks later, the opinion surveys were proven wrong. There has been much written about why they

The number of ways a coin can be tossed 8 times so that there is exactly 4 heads and no two heads occur in a row is:

suppose that in one region of the country the mean amount of credit card debt per household in households having credit card debt is $15,250 with standard deviation $7,125. The probability that the mean amount of credit card debt in a sample of 1600 such households will be within $300 of the population mean is roughly

1-A sweatshirt supplier is trying to decide how many sweatshirts to print for the upcoming NCAA basketball championships. The final four teams have emerged from the quarterfinal round, and there is now a week left until the semifinals, which are then followed in a couple of days by the finals. Each sweatshirt costs $10 to produce and sells for

Suppose the cells of a metastatic tumor are idealized as spheres with a radius of 5 pm (1 pm = l micrometer = one millionth of a meter). The number of cells has a doubling time of 10 days. The tumor is detected in the shape of a sphere with diameter l cm. 1. Estimate the number of cells in the tumor when it is detected. (Assume the cells are

Listed below is the number of movie tickets sold at the Library Cinema-Complex, in thousands, for the period from 2001 to 2013. Compute a five-year weighted moving average using weights of 0.2, 0.1, 0.25, 0.14, and 0.31, respectively. Describe the trend in yield. (Round your answers to 3 decimal places.) 2001 8.81 2002 8.34 2003 7.77 2004 6.39

Beth is interested in studying the effects of movies on peoples' attitudes toward the mentally ill. She obtains a sample of college students who have never seen One Flew Over the Cuckoo's Nest. Half of the students watch the movie and half do not, and then she measures their attitudes toward the mentally ill. She is worried that if participants

Statistics questions about replication randomization blocking 1} In response to a complaint that a particular property tax assessor {A} was biased, a study was conducted in which eight properties were randome selected and each was assessed by assessor A and by an impartial assessor (B). The assessments 1:105 dollars) are shown in the table below.
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In a pulse rate research, a simple random sample of 500 men results in a mean of 80 beats per minute, and a standard deviation of 11.5 beats per minute. Based on the sample results, the researcher concludes that the pulse rates of men have a standard deviation less than 12 beats per minutes. Use a 0.05 significance level to test the researcher's

WHICH DEGREE OFFERS THE BEST POTENTIAL STARTING SALARY?A SURVEY OF 50 ENTRY LEVEL PSYCHOLOGY MAJORS WAS COMPARED TO A SURVEY OF 60 (NOT 50) ENTRY LEVEL ENVIRONMENTAL MGMT MAJORS. LANE AND ILLOWSKY OFFER DIFFERENT FORMULAS FOR THIS PROBLEM (BUT THEY GIVE THE SAME RESULT) CHECK LANE PAGE 408 AND ILLOWSKY AROUND PAGE 530 SECTION 10.1USE EITHER

. If the laser tag fans get their way, and the group bowls only 1 game, will they have enough money to play 5 games of laser tag? Use your expression from question 4 to calculate the cost of 1 game of bowling and 5 games of laser tag

In an independent t-test, if the t-value obtained is less than the critical value, the null hypothesis is not rejected--Correct?

The temperature function (in degrees Fahrenheit) in a three dimensional space is given by T(x, y, z) = 3x + 6y - 6z + 1. A bee is constrained to live on a sphere of radius 3 centered at the origin. In other words, the bee cannot fly off of this sphere. What is the coldest temperature that the bee can experience on this sphere? Where does this

Question 33 20 randomly selected statistics students were given 15 multiple-choice questions and 15 open-ended questions all on the same material. The professor was interested in determining which type of questions the students scored higher. This experiment is an example of None of the alternative answers is correct. a one sample test of means. a

bizneznuz.com, an online business news agency, conducts a poll. Visitors to the site are invited to click on one of two buttons in order to register that they "agree" or "disagree" with the following statement: "Funding for space exploration should be left entirely to the private sector." If bizneznuz.com wants to accurately measure its online

The average return for large-cap domestic stock funds over the three years 20092011 was 14.5%. Assume the three-year returns were normally distributed across funds with a standard deviation of 4.8%. a. What is the probability an individual large-cap domestic stock fund had a three-year return of at least 20% (to 4 decimals)? b. What is the

the time spent (in days)waiting for a heart transplant for people ages 35-49 can be approximated by the normal distrubution u=205 o=25.2 (a) What waiting time represents the 5th percentile and (b) what waiting time represent the third quartile? round to the nearest integer as needed

A travel website would like to estimate the difference between the average rental price of a car with automatic transmission versus the average rental price of a car with manual transmission at a certain airport. The table below shows the average one-week rental prices for two random samples, as well as the population standard deviations and

13. (Learning Outcome 3) Express the null hypothesis and the alternative hypothesis in symbolic form. Use the correct symbol (, p, ) for the indicated parameter. Carter Motor Company claims that its new sedan, the Libra, will average better than 23 miles per gallon in the city. Use , the true average mileage of the Libra.

brief summary please What types of occurrences might result in an incorrect conclusion from hypothesis testing?

The weights of bowling balls are normally distributed with mean 11.5 pounds and standard deviation 2.7 pounds. A sample of 36 bowling balls is selected. What is the probability that the average mean weight of the sample is less than 11.22 pounds? Write only a number.

According to Harper's Index , 40% of all federal inmates are serving time for drug dealing. A random sample of 14 federal inmates is selected. (a) What is the probability that 11 or more are serving time for drug dealing? (Use 3 decimal places.) (b) What is the probability that 5 or fewer are serving time for drug dealing? (Use 3 decimal places.)

What is a time series plot? Select one: a. A plot of data collected at regular intervals over a certain time periodb. A plot thatdisplays observations on the x-axis against randomly spacedtimeintervals on the y-axisc. A plot that displays autoregressive behaviord. A plot of the data distribution

The number of miles driven by a truck driver in a day falls between 200 and 600 , and follows a uniform distribution. At least how many miles does the truck driver travel on the furthest 10 % of days? (Enter your answer as a whole number.) please show work

A national polling company polled Canadians about their coffee consumption and made the following discovery: 80% of Canadians have at least one cup of coffee a day. Two Canadians are randomly chosen on a randomly chosen day. What is the probability Part (a) both consume at least one cup of coffee on the chosen day? Part (b) Refer to the two

Dan McClure is trying to decide on how many copies of a book to purchase at the start of the upcoming selling season for his bookstore. The book retails at $28.00. The publisher sells the book to Dan for $20.00. Dan will dispose of all of the unsold copies of the book at 75 percent off the retail price at the end of the season. Dan estimates that

A 5000-seat theater has tickets for sale at $28 and $40. How many tickets should be sold at each price for a sellout performance to generate a total revenue of $153,200? The number of tickets for sale at $28 should be______ The number of tickets for sale at $40 should be_________

There are 23 people in this class. What is the probability that at least 2 of the people in the class share the same birthday? Show the calculation

15 A statistics teacher wants to see if there is any difference in the abilities of students enrolled in statistics today (2016)and those enrolled five years ago (2011). A sample of final examination scores from students enrolled today and from students enrolled five years ago was taken. You are given the following information: 20162011 the sample

What data is inappropriate for a regression analysis? Select one: a. Residuals that form a pattern when plottedb. Outliers don't existc. The correlation coefficient is less than 1d. You have multiple input variables

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What is the correlation coefficient to r and make a conclusion about the type of correlation. For the following data (a) display the data in a scatter plot, (b) calculate the correlation coefcient r, and (c) make a conclusion about the type of correlation. The ages (in years) of 6 children and the number of words in their vocabulary Age, x 1 2 3 4
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According to AAA, the average price for a gallon of regular gas in North Carolina is $2.63. Assume that the gas price is normally distributed with a standard deviation of $0.17. Calculate the probability that the price lies within 1.5 standard deviations of the mean.

What is the derivative of this function? \f
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Given the function f(x)=4|x7| , calculate the following values. Write each without absolute value. f(12)= f(2)= f()= f(x2+15)=

To begin to better understand personal experiences of headache pain, a drug manufacturer has asked 9 adults to rate their most recent headache on a scale of 0 to 100 (with 0 corresponding to no pain and 100 corresponding to the greatest pain the person has ever felt). Here are the 9 ratings: 54, 12, 65, 23, 26, 34, 20, 17, 43. What is the mean of

1. Jeannie is an experienced business traveler, often traveling back and forth from San Francisco to the East Coast several times per month. To catch her flights from San Francisco she leaves her office one hour before her flight leaves. Her travel time from her office to the departing gate at the San Francisco airport, including the time to park

There is a 0.7 probability that MATH students will correctly follow all instructions on the Exam. What is the probability that exactly 7 of 10 students in a MATH class section correctly follow all Exam instructions? Round answer to the nearest thousandth (three places after decimal). Show work.

A candy company claims that its jelly bean mix contains15% blue jelly beans. Suppose that the candies are packaged at random in small bags containing about 200 jelly beans. If someone receives a bag with 40 blue jellybeans, would he be doubtful of thecompany's claim? Answer by calculating the appropriatez-score

Solve the following related rates. a) A potter forms a piece of clay into a right circular cylinder. As she rolls it, the height h of the cylinder increases and the radius r decreases. Assume no clay is lost. The height is increasing by 0.9 cm/ second. What it the rate at which the radius is changing when the radius is 4cm and the height is 7 cm.

A survey of 239 retail stores revealed that the average price of a microwave was $390 with a standard error of $24. Assuming the population is normally distributed, what is the 95% confidence interval to estimate the true cost of the microwave?

For the following survey results, please provide the mean and median for the number of shows watched: Question = how many kids shows do you let your child watch per day Response Number of respondents 1 30 2 15 3 25 4 18 5 12

QUESTION 1For a test of a mean, which of the following is incorrect? The critical value is based on the researcher's chosen level of significance. In a right-tailed test, we reject H0 when the test statistic exceeds the critical value. H0 is rejected when the calculated p-value is less than the critical value of the test statistic. If H0: 100 and

Graph the function. Please graph the line. f(x) = 1.5x + 2

Define the margin of error. Explain the relation between the confidence interval and the error estimate. Suppose a confidence interval is 9.65 < < 11.35. Find the sample mean x and the error estimate E.

In your own words, explain Benford's law. Give some examples of situations where it applies. Why does the law seem unintuitive at first glance?

There has been a lot of debate over whether the flu vaccine works for old people. All we really know is that 1% of old people die during the 1-2 month flu season. How many of them die because of the u and how many die because of something else is hard to say. To nd out what percent of deaths we can save by the u shot during u season, we decide to
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Problem # 1 : proper statistical testing to conclude if Is there is a difference among population proportions. 5% level of significance ( = .05). # 1#2#3 171820 182126 252833 293628 Problem # 2 : Use ANOVA method to determine if there is a statistical differences among population means. Show all the work. ( = .01). Group 1Group 2Group 3 282655

Date 11/28/2004 12/30/2004 1/30/2005 2/27/2005 3/31/2005 4/29/2005 5/28/2005 6/30/2005 7/27/2005 8/27/2005 9/30/2005 10/29/2005 11/29/2005 12/31/2005 1/21/2006 2/24/2006 3/30/2006 4/29/2006 5/25/2006 6/28/2006 7/28/2006 8/26/2006 9/30/2006 10/31/2006 11/28/2006 12/30/2006 1/27/2007 2/23/2007 3/31/2007 4/28/2007 5/25/2007 6/30/2007 7/28/2007

Researchers wanted to measure the effect of alcohol on the development of the hippocampal region in adolescents. The researchers randomly selected 11 adolescents with alcohol use disorders. They wanted to determine whether the hippocampal volumes in the alcoholic adolescents were less than the normal volume of 9.02 cm3. An analysis of the sample

Find the value of z such that 0.14 of the area lies to the right of z. Round your answer to two decimal places.

1 1. In an office, there are seven women and three men. If one person is selected, find the probability that the person is a woman. a 1/7 . b 3/1 . 0 c 7/1 . 0 d 1/3 . QUESTION 2 1. A grocery store employs cashiers, stock clerks, and deli personnel. The distribution of employees according to marital status is shown below: Marital Status 2. Cashie

The question asks to maximize 2x1 + 2x2 subject to 4x1 + 3x2 >= 12 and -2x1-3x2 = 2 and x1, x2>=0 This is for an linear programing chapter and I don't remember my algebra well enough

Casino games of pure chance (e.g., craps, roulette, baccarat, and keno) always yield a "house advantage." For example, in the game of double-zero roulette, the expected casino win percentage is 5.385.38 % on bets made on whether the outcome will be either black or red. (This implies that for every $5 bet on black or red, the casino will earn a net

The following 11 questions (Q1 to Q11) are based on the following summarized research: (you will need your z-tables from Howell to complete many of these questions) A psychologist studied self-esteem scores and found the data set to be normally distributed with a mean of 50 and a standard deviation of 6. Part A**What raw score cuts off the bottom

Read the case study on page 456 of the textbook entitled \"Southwestern University Traffic Problems.\" As you read the case study, take notes on how the concepts with Network Modeling can lead you to develop effective solutions to the two associated Discussion Questions. How can the concepts with Network Modeling lead you to develop effective

Please help with the below, also can you show any formula's in excel. Thank You A report by the NCAA states that 57.5% of football injuries occur during practices. A head trainer claims that this is too high for his conference, so he randomly selects 36 injuries and finds that 18 occurred during practices. a. Is the above information sufficient

A landscape architect plans to enclose a 2,500 square feet rectangular region In a botanical garden. She will use shrubs costing $18 per foot along three sides and fencing costing $32 per foot along the fourth side. Find the dimensions of the botanical garden that will minimize the total cost. Follow the steps: (a) Let the width (the fencing side)
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Find the derivative of the function f(x) = 6e^x + 3x^2

What a great alternative hypothesis for the claim that the average professional basketball player is at least 6'9" tall Answer true if the statement is always true if the statement is not always true replace the underlined words with the words that make the statement always true Alpha is the measure of the area under the curve of the standard

Perform Inferential Statistics for the dependent variables a. Point estimate b. Confidence Intervals With the following information A survey of 10 graduates 5 Literature Major Graduates make between $30,000-$31,000 3 Technology Graduates make $40,000 2 Computer Science Graduates make $45,000

For the names listed below you would like to put each person's first name in Column F and each person's last name in column G. The easiest way to do this is use the _____________ feature. \f
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Number of Certified Organic Farms in the United States 2001-5,511 2002-5,861 2003-6,589 2004-6,578 2005-7,075 2006-7,985 2007-9,777 2008-11,347 (a) Use Excel, MegaStat, or MINITAB to fit three trends (linear, quadratic, exponential) to the time series. (A negative value should be indicated by a minus sign.Do not round the intermediate

11-40 Maher Saddles, Inc., produces bicycle seats. Among the many seats produced is one for the high-end mountain bicycle market. Mahers operation manager has recently made a change in the production process for this high-end seat and is scheduled to report on measures associated with the new process to become stable, he took a random sample of 25

Let T be the group of nonsingular upper triangular 2 2 matrices with entries in R ; that is, matrices of the form ( a 0 b c ) where a , b , c R and a c = 0 . Let U consistofmatricesoftheform ( 1 0 x 1 ) where x R

how can we explain the difference between discrete and continuous data?Are quantitative data always continuous, or are there examples of quantitative data that are discrete?

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