Extending the School Year A researcher surveyed 100 randomly selected teachers in a large school district and found that 47 wanted to extendthe school year, 41 did not, and 12 had no opinion. At the 0.10 level of significance, is the distribution different from the national distributionwhere 48% wished to extend the school year, 47% did not want the school year extended, and 5% had no opinion? Use the critical value methodwith tables.Part 1 of 5Identify the claim with the correct hypothesis.Ho: The distribution is the same as the national distribution. ClaimH₁: The distribution differs from the national distribution. ClaimPart 2 of 5Find the critical value. Round the answer to at least three decimal places.The critical value isPart 3 of 5Part 4 of 5Make the decision.XCompute the test value. Round the intermediate and final answer to at least three decimal places.XSSXG Part 4 of 5Make the decision.RejectPart: 4/5Part 5 of 5the null hypothesis.Summarize the results.XThere is (Choose one)distributi enough evidence to support the claimnot enough evidence to support the claimenough evidence to reject the claimnot enough evidence to reject the claimthat the distribution differs from the national

Given Information: In a large school district, 100 teachers were randomly selected and found that 47…

Answered: Extending the School Year A researcher…

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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Researchers investigate how the presence of cell phones influence the quality of human interaction. Subjects are randomly selected from a population and divided into an experimental group that is asked to leave their phones in the front of the room and a control group that are not asked to leave their cell phones at the front of the room. Subjects are left alone for 10 minutes and then asked to take a survey designed to measure quality of interactions they had with others in the experiment. What statistical test is appropriate?
In a survey of working parents (both parents working), one of the questions asked was "Have you refused a job, promotion, or transfer because it would mean less time with your family?" 410410 men and 410410 women were asked this question. 26%26% of the men and 19%19% of the women responded "Yes". Based on this survey, can it be concluded that there is a difference in the proportion of men ( p1p1 ) and women ( p2p2 ) responding "Yes"? Use a significance level of α=0.05α=0.05 for the test. Step 3 of 5 : Compute the value of the test statistic. Round your answer to two decimal places.
A survey asked students for their college and their satisfaction with their program. The results are provided in the tables below. Determine if there is a relationship between college and satisfaction at the 0.05 level of significance. Satisfied Not Satisfied Arts and Sciences 5 2 Education 6 1 Technology 14 12 Business 18 12 Health Profession 10 4 Social and Behavioral Sciences 8 12 H0: College and Satisfaction are independent. H1 : College and Satisfaction are dependent. Determine the p-value. What is the correct decision for this test? What is your conclusion, in context? Explain your reasoning.
A study compared the drug use of 288 randomly selected high school seniors exposed to a drug education program (DARE) and 335 randomly selected high school seniors who were not exposed to such a program. Data for marijuana use are given in the accompanying table. sample size number who use marijuana exposed to DARE 288 139 not exposed to DARE 335 181 At the 5% significance level, is there convincing evidence that the proportion using marijuana is lower for students exposed to the DARE program? Round these answers to two places after the decimal:Test-statistic = _________(to two places after the decimal)P-value =_________ (to four places after the decimal)There __is/ is not__________ sufficient evidence to conclude that the proportion of students using marijuana is lower for students exposed to the DARE program.
A study compared the drug use of 288 randomly selected high school seniors exposed to a drug education program (DARE) and 335 randomly selected high school seniors who were not exposed to such a program. Data for marijuana use are given in the accompanying table. sample size number who use marijuana exposed to DARE 288 141 not exposed to DARE 335 181 At the 5% significance level, is there convincing evidence that the proportion using marijuana is lower for students exposed to the DARE program?Round these answers to two places after the decimal:Test-statistic = (to two places after the decimal)P-value = (to four places after the decimal)There sufficient evidence to conclude that the proportion of students using marijuana is lower for students exposed to the DARE program.
In a survey, 37% of the respondents stated that they talk to their pets on the telephone. A veterinarian believed this result to be too high, so he randomly selected 200 pet owners and discovered that 73 of them spoke to their pet on the telephone. Does the veterinarian have a right to be skeptical? Use the a = 0.1 level of significance. Because npo (1- Po) 10, the sample size is 5% of the population size, and the sample the requirements for testing the hypothesis satisfied. (Round to one decimal place as needed.) Enter your answer in the answer box and then click Check Answer. ? 4 parts remaining Clear All Check Answer Screen Shot 202...png Show All
Spam: A researcher reported that 71.8 % of all email sent in a recent month was spam. A system manager at a large corporation believes that the percentage at his company may be 69%. He examines a random sample of 500 emails received at an email server, and finds that 365 of the messages are spam. Can you conclude that greater than 69% of emails are spam? Use both a=0.01 and a= 0.05 levels of significance and the critical value method with the table. Part 1 of 5 State the appropriate null and alternate hypotheses. Ho: P- .69 H1: p> .69 This hypothesis test is a right-tailed V test. Part 2 of 5 Find the critical values. Round the answers to three decimal places. For a=0.01 , the critical value is 2.326 For a=0.05 , the critical value is 1.645 Part: 2/5 Part 3 of 5 Compute the test statistic. Do not round intermediate calculations. Round the answer to two decimal places.
What social media tools do marketers commonly use? Researchers surveyed marketers who commonly use an indicated social media tool. Surveyed were B2B marketers, marketers focusing primarily on attracting businesses, and B2C marketers, marketers targeting consumers. Suppose the survey was based on 500 B2B and 500 B2C marketers and yielded the results in the table below. For each social media tool, at the 0.05 level of significance, determine whether there is a difference between B2B marketers and B2C marketers in the proportion who used each social media tool. Social Media Tool B2B B2CA 84% 91%B 84% 76%C 82 % 61%D 39% 53% What is the p-value for the test statistic and interpretation? For Tool B determine the test statistic. What is Tool B p-value 12. EOC
A political science professor wants to determine her students’ attitude toward a presidential executive order preventing the construction of the Keystone Natural Gas pipeline. She has a sample of 50 students complete an interval level, 7-point scale assessing their attitude toward the policy where 1 = highly unfavorable 2= moderately unfavorable, 3 = slightly unfavorable, 4 = neutral, 5 = slightly favorable, 6 = moderately favorable, 7 = highly favorable. The sample mean is 4.6 with a standard deviation of 1.2. Using α = .01 what can she conclude regarding her students’ attitude toward the policy?
A 2018 Gallup poll found 20% of adults aged 18 - 29 years vape. Test the claim that the proportion of 18 - 29 year old people who vape has decreased at the 5% significance level. A July 2021 Gallup poll resulted in 17% of the 1,007 of people that age vape.
Is College Worth It? In the New York Times article “College Graduates Fare Well in Jobs Market, Even through Recession,” C. Rampell noted that college graduates have suffered through the recession and lackluster recovery with remarkable resilience. Of a random sample of 1020 college graduates, 35 were unemployed; and of a random sample of 1008 high-school graduates (no college), 69 were unemployed. a. At the 1% significance level, do the data provide sufficient evidence to conclude that college graduates have a lower unemployment rate than high-school graduates? b. Find and interpret a 98% confidence interval for the difference in unemployment rates of college and high-school graduates.
Q) A doctor wants to try three different techniques to investigate the blood pressure of people diagnosed with high blood pressure. The first group of subjects takes medication, the second group does exercises, and the third group follows a special diet. A month later, the reduction in each person's blood pressure is recorded. At 5% significance level, test the claim that there is no difference among the means. The data are shown. Medication Exercise Diet 10 5 12 8. 9. 9. 3 12 15 8. 13 2 4

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