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Mathematics Questions and Answers February 28, 2023

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Some of the same questions The decision to reject or fail to reject a null hypothesis is based on computing a ________ from sample data. (Points : 1) population parameter critical value level of significance test statistic Question 2. 2. Use the below information to answer the question. A company wishes to test whether the proportion of female

Decision Sciences LeBow College of Business Drexel University 3220 Market Street Philadelphia, PA 19104 STAT 201 - Business Statistics I Final Name (Last, First) : Student ID Card# : Part I. T/F Questions (2 points each) (T/F) 1. In a simple regression, there are n - 1 degrees of freedom associated with the error sum of squares (SSE). (T/F) 2. The

STAT 200. Week 2 Homework LANE, CHAPTER 2. For the data from the 1977 Stat. and Biom. 200 class for eye color, construct: a. pie graph b. horizontal bar graph c. vertical bar graph d. a frequency table with the relative frequency of each eye color 7. Which of the box plots on the graph has a large positive skew? Which has a large negative skew? 9.

Mr. and Mrs. Tran are expecting a baby girl in a few days. They want to put away money for her college education now. How much money should they deposit in an account paying 10.2% so they will have $100,000 in 18 years to pay for their daughter's educational expenses? P =unknown r =10.2% or 0.102 n =monthly=12 A = $100,000 t =18years Formula A= P

question from Statistics!!! The owner of fish market determined that the average weight for a catfish is 3.2 pounds with a standard deviation of 0.8 pound. Assuming the weights of catfish are normally distributed , the probability that randomly selected catfish will weigh more than 4.4 pound is

Use the calculator provided to solve the following problems. Suppose that x^2follows a chi-square distribution with 8degrees of freedom. ComputeP( x^ less thanor equal to 5). Round your answer to at least three decimal places. Suppose again that x^2follows a chi-square distribution with 8degrees of freedom. Findsuch thatP (x^2 greater or equal to

Score: Week 2 <1 point> 1 Testing means - T-tests In questions 2 and 3, be sure to include the null and alternate hypotheses you will be testing. In the first 3 questions use alpha = 0.05 in making your decisions on rejecting or not rejecting the null hypothesis. Below are 2 one-sample t-tests comparing male and female average salaries to the

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Unit 3 Dropbox Assignment Answers by (Insert your name here) In the summary tables below, insert only the answers. You will show work after the summary section. Question 1 answer Make sure you use full sentences for the items below. Do not simply say something like \"x1

Find an equation for thelinethat passes through the points 1,1and-3,5

Applied Statistics Read each of the research scenarios and answer the questions. 1. A group of student researchers believe that there is a relationship between attitudes toward social issues (110) and amount of political activity (0-15). The group surveyed students (N=102) at the union every day for an entire semester about their attitudes toward

please help and show work Find the slope-intercept form of the line which passes through the points P(-1,0) and Q(-4,6).

In a test of the difference between the two means below, what should the test value be for a t test? sample 1 sample 2 sample mean 80 55 sample variance450 80 sample size 10 14 a) 0.17 b) 0.18 c) 0.49 d) 3.51

The average number of days required by a colleges undergraduate students to complete a projectwas 22 days in the previous year. The college administration wishes to determine whether theaverage differs this year. A sample of 20 students produced a sample mean of 20 days this year,with a sample standard deviation of 6 days. Assume that the number

A student receives test scores of 62, 83, and 91. The students final exam score is 88 and homework score is 76. Each test is worth 20% of the final grade, the final exam is 25% of the final grade and the homework grade is 15% of the final grade. What is the students mean score in the class? I have the answer, I just need to see how the problem is

A test is designed so a student who studies will pass 80% of the time, but a student who does not study will pass 9% of the time. A certain student studies for 89% of the tests taken. On a given test, what is the probability that student passes

Question 12 of 12 Thirty-three college freshmen were randomly selected for an on-campus survey at their university. The participants' mean GPA was 2.5, and the standard deviation was 0.5. What is the margin of error, assuming a 95% confidence level? (Assume a normal distribution.) 2.037 0.171 0.0313 0.354 None of the above

At the end of Section 8.3, it was noted that for samples of serum cholesterol levels of size 25----drawn from a population with mean = 211 mg/ 100 ml and standard deviation = 46 mg/100 ml----the probability that a sample mean x lies within the interval (193.0, 229.0) is 0.95. Furthermore, the probability that the mean lies below 226.1 mg/100 ml is

MAT510 Business Statistics Suppose that there are two (2) candidates (i.e., Jones and Johns) in the upcoming presidential election. Sara notes that she has discussed the presidential election candidates with 15 friends, and 10 said that they are voting for candidate Jones. Sara is therefore convinced that candidate Jones will win the election

Activity Solution: Multiple Linear Regression Consider three dierent datasets (labelled A, B, C), each of which consists of n = 25 measurements of (Y, X1 , X2 ), depicted as follows: 1 2 1. Clickers question: Think about how the bivariate scatterplots would appear in each case, that is, plots of Y against X1 and Y against X2 . (a) AD, BE, CF. (b)

Sales Earnings 89.2 18.6 18.2 71.7 58.6 46.8 17.5 11.9 19.6 51.2 28.6 69.2 4.90 4.40 1.30 8.00 6.60 4.10 2.60 1.70 3.50 8.20 6.00 12.80

In problems 23-25 discuss the validity of each statement. Explain why it is true or give a counter example. 23. If a matrix game is fair then all payoffs are zero. 24. If half of the payoffs are positive and half of the payoffs are negative then the game is fair. 25. If a matrix game is fair then some of the payoffs are positive and some of the

Frequency Distribution Outpatient wait time. Waiting times in (minutes) for 25 patients at a public health clinic are : 35, 22, 63,6, 49, 19, 16, 31, 24, 29, 23, 32, 72, 13, 51, 45, 77, 16, 33, 55, 10, 42, 28, 72, 13. a)Create a templet of these data. Describe the distribution"s shape, location, and spread. b)From the stemplot, create a frequency

find the IQR for scores: 0, 3, 4, 7, 8, 9, 10, 12, 15

A manufacturer of hospital supplies has a uniform annual demand for 320,000 boxes of bandages. It costs $20 to store one box of bandages for one year and $500 to set up the plant for production. How many times a year should the company produce boxes of bandages in order to minimize the total storage and setup costs?

Need help with this 1 question. I have 11pm but is actually by 1145pm A sample of 9 production managers with over 15 years of experience has an average salary of $71,000 and a sample standard deviation of $18,000. Assuming that the salaries of production managers with over 15 years experience are normally distributed, you can be 95% confident that

If anyone have these answers, i need help please. An orifice meter is used to measure the volume flow rate in a pipe. It takes 12 readings (in m3/s): 0.0182, 0.0188, 0.0179, 0.0183, 0.0182, 0.0176, 0.0191, 0.0185, 0.0184, 0.0180, 0.0178, and 0.0186. The true volume flow rate is 0.017920 m3/s. a. Estimate the bias error (also called the systematic

In a sample of 800 U.S. adults,208 dine out at a restaurant more than once per week.Two U.S. adults are selected at random from the population of all U.S. adults without replacement. Assuming the sample is representative of all U.S. adults, complete parts (a) through (d). (a) Find the probability that both adults dine out more than once per week.

1) If P(A) = P(A|B), then events A and B are said to be A.mutually exclusive B.complementary C.exhaustive D.independent Question According to an Internet posting, 80% of adults enjoy drinking beer. A group of 7 adults is chosen randomly. The probability that no more than 3 of them enjoy drinking beer is: A.0.029 B.0.267 C.0.429 D.0.033 Part 4 of 9

Commentary Beyond Black Box Epidemiology Douglas L. Weed, MD, PhD "Black box epidemiology" is the most recent addition to a long list of disciplinary subgroups although few practitioners would likely trumpet their allegiance to it. Epidemiology's many subdisciplines represent the wide applicability of a growing and dynamic field and,

suppose that a student collects pulse rates from a random sample of 200 students at her college and finds a 90% confidence interval from 65.5 to 71.8 beats per minute. is the following statement an appropriate interpretation of this interval?

Can we conclude that the population mean adult sodium level differs from that claimed by the laboratory

Sales $7,642 $6,262 $9,432 $7,498 $4,369 $3,020 $3,877 $6,061 $6,981 $8,681 $9,121 $8,758 $3,986 $7,390 $6,685 $7,498 $9,248 $6,326 $11,221 $11,146 $4,670 $6,312 $9,990 $7,515 $9,332 $3,390 $7,451 $5,546 $7,472 $3,407 $5,761 $6,437 $9,779 $10,497 $9,837 $9,112 $10,898 $8,703 $11,552 $8,305 $9,010 $3,287 $8,535 $4,827 $5,605 $9,525 City Los Angeles

An upper-level sociology class at a large urban university has 120 students, including 34 seniors, 57 juniors, 22 sophomores, and 7 freshmen If instead you are to select a disproportionate sample of size 20 from the classroom, with equal numbers of students from each class level in the sample, how many freshmen will there be in the sample

Three characters, A, B, and C, armed with guns, suddenly meet at the corner of a Washington, D.C. street, whereupon they naturally start shooting at one another. Each street-gang kid shoots every tenth second, as long as he is still alive. The probability of a hit for A, B, and C are , , and , respectively. A is the most hated, and therefore, as

Week 2 Discussion Due Wednesday You have a biased dice (with six faces numbered 1,2,3,4,5 and 6) in that even numbers are twice as likely as odd numbers to show. You toss the dice 15 times. What is the probability that 1-An even number would show up 5 times? 2-1 would show up five times? 1-Can it be formulated as a Binomial distribution for

Part I Enzyme immunoassay (EIA) tests are used to screen blood specimens for the presence of antibodies to HIV, the virus that causes AIDS. Antibodies indicate the presence of the virus. The test is quite accurate but is not always correct. Here are approximate probabilities of positive and negative EIA outcomes when the blood tested does and does

Objective: Earlier, you have made some progress as a result of the stem-and-Ieaf diagram. How did the team make the improvement? They saw that the diagram showed a bi-modal condition so the team identified the source of this condition; eliminated one of the sources and optimized accordingly. The two sources were found to be: 1) Some of the

Henry Clements is a friend of yours who has a car rental agency in major metropolitan area. Although he is an independent company he works closely with three other independent companies in metro area. They share information and each they forecast the number of cars each will need the following week. Then if needed, the will transfer cars between

7. (TCO D) A contract dispute between the National Football League and the Players Association arose regarding the retirement system. The NFL agreed to a settlement only if it could be shown convincingly that less than 60% of the players retired with 5 years or less playing time in their careers. A random sample of 200 retired NFL players is

my daughter needs help with multiplication, she is in 4th grade and she just does not get it at all.

describe the concept of confidence interval in your own words, then provide at least two instances of where this topic might be used in your future career.

The population of lumber is normally distributed with a mean of 30.05 inches and a standard deviation of 0.3 inches. What is the probability that the average length of a piece of lumber from a sample of 9 units is more than 29.95 inches long?

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A survey of employees at a company finds that 32 of the 88 employees who drive to work were ever late during the past year, and 18 of the 64 employees who took public transportation were ever late during the past year. At = 0.10, is there a difference between the proportion of employees who drove who were ever late and the proportion of employees

Parallel & Perpendicular Lines Given an equation of a line, find equations for lines parallel or perpendicular to it going through specified points. Find the appropriate equations and points from the table below. Simplify your equations into slope-intercept form. y = -x + 7; (-7,-1)

Suppose you receive a shipment of 8 televisions. 3 of the televisions are defective. If 2 televisions are randomly selected, what is the probability that both televisions work? What is the probability that at least 1 of the 2 televisions does not work

Provide the relevant standard error or test statistic used in the following significance testing situations. 6. A college admissions website tells potential students that the average amount spent on textbooks is $300.00 per semester. A student group decides to research book cost because it now believes that book cost per semester is greater than

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Her sample consists of 20 porcupines. A bootstrap distribution for the correlation between body mass and length (based on 1,000 samples) is provided. would it be appropriate to use this bootstrap distribution to estimate a 95% confidence interval for the correlation between body mass and length of porcupines? Explain briefly.

Mr. Smith works on the 13th floor of a 15 floor building. The only elevator Moves continuously through floors 1, 2, . . . , 15, 14, . . . , 2, 1, 2, . . . , except that it stops on a floor on which the button has been pressed. Assume that time spent loading and unloading passengers is very small compared to the travelling time. Mr. Smith complains

Weeks Sales 77 21200 76 24000 75 30600 74 25000 73 20800 72 23000 71 22800 70 20800 69 20000 68 19600 67 19600 66 19800 65 17200 64 17600 63 18000 62 19200 61 19000 60 19600 59 18000 58 18100 57 20000 56 19400 55 22400 54 18800 53 20900 52 21400 51 18700 50 16800 49 15500 48 15400 47 18600 46 15800 45 15200 44 15000 43 17800 42 14400 41 15000 40

Use the given information to find the P-value. Also, use a 0.05 significance level and state the conclusion about the null hypothesis (reject the null hypothesis or fail to reject the null hypothesis). The test statistic in a left-tailed test is z = -1.83. 0.0672; reject the null hypothesis 0.0336; reject the null hypothesis 0.9664; fail to reject

A total of 7.9 percent of the prime time viewing audience watched shows on ABC, 8.2 percent watched shows on CBS, 4.5 percent on Fox, 6.7 percent on NBC, 3.1 percent on Warner Brothers, and 3.4 percent on UPN. A total of 66.2 percent of the audience watched shows on other cable networks, such as CNN and ESPN. What will be the prime time viewing

Describes the theory the researchers explore. What are the key constructs in the theory? How are they related? Identify which ones are cause, effect, mediating, or moderating constructs. How are the constructs operationalized? Briefly describe the study, including the number of participants and research methods. Briefly describe the statistical

Construct a 95% confidence interval for 1 - 2. Two samples are randomly selected from normal populations. The sample statistics are given below. n1 = 11 n2 = 18 x1 = 4.8 x2 = 5.2 s1 = 0.76 s2 = 0.51

John is 45 years old and wants to retire at 65. He wishes to make monthly deposits in an account paying 12% compounded monthly so when he retires he can withdraw $280 a month for 30 years. How much should John deposit each month?

QUESTION 2 A.Suppose that sales in a Wal-Mart store are normally distributed with a meanof$90 million and a standard deviationof$ 10 million. 1.What is the probability that sales will be less than or equal to$86million?2.What is the probability that sales will exceed$95million? B.The stock price of Wal-Mart is normally distributed with a mean of

Creating and Using Codebooks This assignment will allow you to practice creating and using codebooks. There are three parts to this worksheet. In part one you will create a codebook based on a provided example survey. In part two you will write survey questions based on a provided codebook. In part three you will practice data entry using a

Tutor Marked Exercise 3 I. Theory Component Where relevant, keep all your middle work as well as your final answer to a minimum of four decimals, unless otherwise stated. 1. Carefree Hospital is a government funded institution that operates in a small Canadian city. Carefree recorded the number of daily emergency visits (rounded to the nearest 50)

uiz 1_Stat230: You must use the TFE Editor to present your answers. Download the Quiz and post your answers via the Assignment Folder. For question #1, a typical row for the Stem & Leaf plot might look like 3|0269. Where, the vertical line is obtained by using \"Shift & |\\\" key. The line is inserted at the location of the cursor. Submit quiz via

ductory Statistics Third Edition Perdisco Submit answers Bookmark Assessment Below is a set of assessable homework questions on this topic, selected by your professor. Take care! Do not submit your answers until you have read all the instructions and answered the questions carefully. When you submit your answers, you will receive immediate

5: Two-Way ANOVA Name: __________________________________ In this assignment, you will: 1. Enter raw data into an SPSS file 2. Conduct a Two-way ANOVA in SPSS 3. Compute effect sizes for any significant F-tests 4. With the help of SPSS plots, interpret the interaction using plain language A professor in physical education conducts an experiment to

decreasing the confidence level (say, from 95% to 85%) will cause the width of a typical confidence interval to increase, decrease. or remain the same?

Use Rstudio and Create a Rmarkdown file for this problem You want to conduct an experiment to test the effect of a new drug for treating children with attention deficit disorder. You have decided to test six different amounts of the new drug-5, 7, 9, 11, 13, and 15 mg. The parents of 40 children with attention deficit disorder have volunteered

When 345 college students are randomly selected and surveyed, it is found that 110 own a car. Use this data to find a 99% confidence interval for the true proportion of all college students who own a car. 0.254 < p < 0.383 0.270 < p < 0.368 0.260 < p < 0.377 0.278 < p < 0.360

Score: <1 point> Week 2 1 Testing means - T-tests In questions 2 and 3, be sure to include the null and alternate hypotheses you will be testing. In the first 3 questions use alpha = 0.05 in making your decisions on rejecting or not rejecting the null hypothesis. Below are 2 one-sample t-tests comparing male and female average salaries to the

6 week 7 homework Question 1 with table Question 2 with Question 3 with with data set Question 3 with with data set Question 4 with with table Data Sets Table question 1 None for question 2 Question 4 table Boiler Design Boiler Drum capacity, pressure, type, x3 type, x4 x1 x2 3,137 120,000 375 1 1 3,590 65,000 750 1 1 4,526 150,000 500 1 1 Hours,

a manufacturing company produces steel housing for electrical equipment. the main component part of the housing is a steel trough that is made out of a 14 gauge steal coil.It is produced using a 250-ton progressive punch press with a wipedown operation that puts two 90 degree forms in the flat steel to make the trough. the distand from one side of

If a securitys return is plotted above the security market line, then

Use a normal approximation to find the probability of the indicated number of voters. In thiscase, assume that 115eligible voters aged18-24 are randomly selected. Suppose a previous study showed that among eligible voters aged18-24, 22% of them voted. Probability that fewer than 30voted

MAT 510 - Homework Assignment Homework Assignment 7 Due in Week 8 and worth 30 points The experiment data in below table was to evaluate the effects of three variables on invoice errors for a company. Invoice errors had been a major contributor to lengthening the time that customers took to pay their invoices and increasing the accounts

The access code to a houses security system consists of seven digits. How many different codes are available if each digit can be repeated? A) 1,000,000 B) 46,656 C) 64 D) 6

Test 3 Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Simplify. Write the answer with positive exponents. 1) 2x3 7x5 A) -14x15 2) (6x - 2)0 A) 1 3) B) 14x15 C) -14x8 D) 14x8 B) 0 C) 6x + 1 D) -1 B) x7 y7 C) x7 y6 D) x8 y7 x12y11 x4 y4 A) xy7 4) 3 -2 A)

Size (Square feet) Rent ($) 524 1110 616 1175 666 1190 830 1410 450 1210 550 1225 780 1480 815 1490 1070 1495 610 1680 835 1810 660 1625 590 1469 675 1395 744 1150 820 1140 912 1220 628 1434 645 1519 840 1105 800 1130 804 1250 950 1449 800 1168 787 1224 960 1391 750 1145 690 1093 840 1353 850 1530 965 1650 1060 1740 665 1235 775 1550 960 1545 827

As an educational researcher, would like to know whether high school students perceptions about mathematical utility changed between their freshman and senior year. Each respondent is asked the same series of questions about the utility of mathematics in their future during their freshman and senior year. These questions are combined to form one

Explain the four-step method of hypothesis tests in clear language to a friendwho has not taken statistics.

The cost, in dollars, of producing x yards of a certain fabric is C(x) =1100+14x0.1x 2 + 0.0005x 3 . 1)Compare C' ( 300 )with the cost of manufacturing the301styard of fabric. (Round your answers to four decimal places.)The cost of manufacturing the301styard of fabric is C (301) C ( 300 )

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For the following polynomial one zero is is given. Find the remaining zeros P(x)=x 4 +72x 2 -729 9i is a zero

Japan is reported to have among the highest percentage of citizens aged 60 years and over,at approximately 26.4 % (i.e. 26.4 % of its population falls within this age category). If 49 individuals are randomly selected from the population, and X is the number of individuals out of 50 that are 60 or more years old, what is: a) The mean of X ?

when interpreting F (2,27)= 8.80 p

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A quality control engineer inspects 300 widgets on an assembly line and finds that 18 are defective. The assembly line should produce defective at a rate of no more than 5 defectives for every 100 produced. Are the inspectors results that the line should be shut down and repaired? Use significance level = 0.01.

A study is run to estimate the mean total cholesterol level in children 2-6 years of age. A sample of 9 participants is selected and their total cholesterol levels are measured as follows. 185 225 240 196 175 180 194 147 223 Generate a 95% confidence interval for the true mean total cholesterol levels in adults with a history of hypertension.

Graph the following interval on the number line: (-6, 5]

In a poll conducted by the Gallup organization, 16% of adult, employed Americans were dissatisfied with their amount of vacation time. You conduct a survey of 600 adult, employed Americans. Approximate the probability that less than 80 are dissatisfied with the amount of their vacation time.

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Comparing Populations Using Statistical InferenceResources Comparing Populations Using Statistical Inference Scoring Guide. APA Style and Format. Capella Writing Center. Mall Time Results. For this assignment, you will practice applying statistical inference to business decision scenarios. In order to complete this assignment, you will need to use

Unit 8 Assignment Started: Oct 29 at 9:28pm Quiz Instructions Please note: you will not need to use STATA for this assignment. There are a few questions in this assignment that require a signicant amount of work and are repeated in the homework. The questions that are the same all have the same answers. Please choose one response for each

Assume that women's heights are normally distributed with a mean given by= 64.6,and a standard deviation given by =2.7in. (a) If 1 woman is randomly selected, find the probability that her height is less than 65in. (b) If 50women are randomly selected, find the probability that they have a mean height less than 65in.

Eight guests are invited for dinner. How many ways can they be seated at a dinner table if the table is straight with seats only on one side? A) 362,880 B) 3,628,800 C) 40,320 D) 1

Solve first two problems in interval (0,360) 2 4 sin =3 1) 2 sin x cos2 x= 0 2 Explain what is wrong with this problem Find csc given that sin = 4/3

1) Let X1,X2,... be i.i.d. Uniform[0,1] r.v's. Let Yn = max(X1,X2,...Xn). Show that the infinite sequence of r.v.'s Y1,Y2,... converges in probability to the degenerate r.v. Y where P(Y = 1) = 1. 2)Let Y~ Uniform[0,1], and let Xn =Y^n. Show that {Xn} converges with probability 1 to the degenerate r.v. X where P(X= 0) = 1

Can you please help me answer the following question with all work shown typed out, without using excel? The following statistics were calculated in a regression analysis procedure. DF = 7.0 b0 = -10.8 b1 = 3.0 Sb1 = 21.0 Test the null hypothesis that the slope of the regression line is zero at the .01 significance level.

Car 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 Size Displacement Cylinders Compact 3.1 6 Compact 3.1 6 Compact 3 6 Compact 3 6 Compact 3 6 Compact 3 6 Compact 2.4 4

WHICH OF THE FOLLOWING EQUATIONS ARE EQUIVALENT TO 6X-7Y=42? A. Y=-7/6X +42 B. Y-6=6/7 (X-14) C.Y=6/7X - 6 D. -6X + 7Y =-42 E. NONE OF THE EQUATIONS ARE EQUIVALENT TO 6X-7Y=42

why it is important to calculate a confidence interval and how do we use it in everyday life. please give examples. and no plagiarism. minimum 200 words.

Which of the following isnota correct description of the graph of the functiony= -2x- 7? a ) The graph of the function contains the point (2, 3), and when the value of x increases by 1 unit, the value of y decreases by 2 units. b ) The graph of the function contains the points (1, 5), (2, 11), and (4, 15). c ) The graph of the function is a line

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