9) A public opinion poll surveyed a simple randomsample of 1000 voters. Respondents were classified bygender (male or female) and by voting preference(Republican, Democrat, or Independent). Results areshown in the contingency table below.Voting PreferencesRow totalMaleFemaleColumn totalRepublican Democrat Independent20015050250450300450501004006001000Is there a gender gap? Do the men's voting preferencesdiffer significantly from the women's preferences? Use a0.05 level of significance.

Answered: 9) A public opinion poll surveyed a…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The Women’s Institutional Studies group at a Midwestern university wanted to compare the percentages of female faculty members in the various units on campus in Spring 2004. Of particular interest were the percentages of female faculty in the College of Education and in the College of Business . In a sample of 80 College of Education faculties, there were 36 females, and in a sample of 70 College of Business faculties, there were 15 females. Based upon this sample information, which of the following is the 98% confidence interval for the difference in the actual percentages of female faculty between College of Education and College of Business ? a. (0.075, 0.405). b. (0.123, 0.357). c. (-0.012, 0.252). d. (0.058, 0.422). e. (0.101, 0.379).
A mayor running for re-election claims that during his term, average municipal taxes have fallen by $225. A conscientious statistician wants to test this claim. She surveys 37 of her neighbors and finds that their taxes decreased (in dollars) as follows: 239, 231, 221, 213, 237, 213, 225, 240, 238, 217, 226, 221, 189, 189, 222, 219, 219, 226, 209, 225, 243, 223, 248, 258, 221, 234, 267, 225, 225, 217, 215, 236, 245, 241, 256, 226, 220 The statistician assumes a population standard deviation of $14. Do you think the statistician should reject the mayor's claim? Why or why not? Step 1: State the hypothesis. ? v = Step 2: Determine the Features of the Distribution of Point Estimates Using the Central Limit Theorem. By the Central Limit Theorem, we know that the point estimates are Select an answer with distribution mean and distribution standard deviation Step 3: Assuming the Claim is True, Find the Probability of Obtaining the Point Estimate. P( ? ♥ P(? v ? v Step 4: Make a Conclusion…
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You have a small sample of voting information for a recent election. This includes data on which party a person voted for (dem-1 for democrat, =0 for other), gender (male=1 for male, =0 for female), income (in thousands of dollars) and age (in years). You create a table tabulating votes by gender. 1 dem I 01 11 0.045 O.348 545 0.602 -+- O.500 male 0 10 12 Total I 22 In a linear probability model of dem on male, what is the intercept coefficient? (Hint: calculate the relevant probabilities.) 11 Total 81 18 61 18 ------- + 141 36
The bookstore at IRSC would like to estimate the proportion of students who prefer electronic textbooks (eBooks) over printed textbooks (hard copies). A random sample of 30 students was surveyed. Their preferences are listed below. hard copy hard copy hard copy hard copy eBook hard copy hard copy hard copy hard copy hard copy hard copy hard copy hard copy hard copy hard copy hard copy hard copy hard copy hard copy hard copy eBook eBookeBook hard copy hard copy hard copy hard copy hard copyhard copy hard copy Determine the point estimate, and the sample standard deviation, hat p; s hat p Round the sample proportion to four decimal places and round the standard deviation to six decimal places, if necessary hat p = Box; s_{p} = Using a 96% confidence level, determine the margin of error, E, and a confidence interval for the proportion of all students at the college who work prefer eBooks over printed textbooksReport the confidence interval using interval notationReport the solutions in…
I AM RESUBMITTING THIS QUESTION FOR DIFFERENT PARTS. I NEED THE LAST 3 MULTIPLE CHOICE QUESTIONS ANSWERED. 5, 6, AND 7 Before the furniture store began its ad campaign, it averaged 160 customers per day. The manager is investigating if the average has changed since the ad came out. The data for the 16 randomly selected days since the ad campaign began is shown below: 131, 127, 148, 143, 141, 153, 158, 145, 138, 163, 164, 148, 166, 154, 170, 133 Assuming that the distribution is normal, what can be concluded at the αα = 0.05 level of significance? For this study, we should use Select an answer t-test for a population mean z-test for a population proportion The null and alternative hypotheses would be: H0:H0: ? μ p Select an answer < = ≠ > H1:H1: ? p μ Select an answer = > ≠ < The test statistic ? t z = (please show your answer to 3 decimal places.) The p-value = (Please show your answer to 4 decimal places.) The p-value is ? ≤ > αα Based…
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The nonprofit group Public Agenda conducted telephone interviews with three randomly selected groups of parents of high-school children. There were 202 black parents, 202 Hispanic parents, and 201 white parents. The sample survey asked the parents to respond to the statement, "A college education has become as important as a high school diploma used to be." Here are the counts of responses: Strongly agree Somewhat agree Somewhat disagree Strongly disagree TOTAL Black parents 154 27 11 10 202 Hispanic White parents 144 37 13 8 202 parents 125 50 18 8 201 Write a brief report on the similarities or differences among the three groups of parents in their attitudes towards the importance of a college education. Include a graph or graphs and a test of significance.
The following contingency table shows the results of a car dealership's recent survey, recording their customers gender as well as the make of their car. Ford Toyota VW Men 15 10 13 Women 16 10 10 If a customer is selected randomly, find P (Woman AND VW)? Final answer should be expressed as a decimal and not a percentage.Only round your final answer to 2 decimal places.
The city of Raleigh has 10500 registered voters. There are two candidates for city council in an upcoming election: Brown and Feliz. The day before the election, a telephone poll of 500 randomly selected registered voters was conducted. 158 said they'd vote for Brown, 293 said they'd vote for Feliz, and 49 were undecided.Give the sample statistic for the proportion of voters surveyed who said they'd vote for Brown. Note: The proportion should be a fraction or decimal, not a percent.

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