4) Compare our obtfined z-score with the critical z-score and determine whether we should reject the nullhypothesis:5) Fully interpret the results in terms of your hypotheses, including the approximate probability our null hypothesiswould be correct in a perfect world:A study conducted by the research institute of America has concluded that the mean number of hours a person spends intheir car during a typical week in 1999 15 hours. Given that times have changed in the past 20 years in terms ofemployment rates and public transit, it is reasonable to believe people spend more or less time in their car every week.Because we can see it going either way, we want to test the nul hypothesis that the people spend 15 hours in their caragainst our alternative hypothesis that people spend a different amount of time in the car in 2019 compared to 1999.To test this hypothesis, assume we distributed a survey to 100 randomly selected adults in San Antonio as asked themabout their driving background. We found the following information:Sample Statistics:I time spent in a car 18.3 hours (SD 11.7)Use this information to complete ALL 5 steps of hypothesis testing. You should

The research institute of America conducted a study that the mean number hours people spend in their…

Answered: 4) Compare our obtpined z-score with…

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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Question 8 of 8 An HR administrator wishes to know the proportion of employees that are currently using a very costly benefit to determine if it is still considered valuable by the staff. If the administrator has no preliminary notion of the proportion of employees using the benefit, how big a sample must she collect to be accurate within 0.14 at the 80% level of confidence? Standard Normal Distribution Table Round up to the next whole number
A quiz related to digital knowledge was conducted. The quiz had 10 questions and covered topics such as the purpose of browser cookies, phishing scams, and privacy policies. The survey was given to 50 people. The mean score is 4.1 with a standard deviation of 2.6. We want to know if the data provide evidence that the mean score in the population is lower than 5. We will use alpha = 0.05 to make our decision. What is the null hypothesis for this question? Group of answer choices a. The proportion of people who pass the test is 5. b. The mean test score of the population is 5. c. The mean test score of the 50 people who took the test is 5. d.The standard deviation is 2.6
You are the manager of a restaurant that delivers pizza to college dormitory rooms. You have just changed your delivery process in an effort to reduce the mean time between the order and completion of delivery from the current 25 minutes. A sample of 36 orders using the new delivery process yields a sample mean of 22.4 minutes and a sample standard deviation of 6 minutes. Perform a hypothesis test to determine if there’s evidence that the population mean delivery time has been reduced below the previous population mean value of 25 minutes by answering the following questions: (a) What are the null and alternate hypotheses for this test? (b) What is the value of the test statistic for this test? (c) Using the critical value approach, at the 0.05 level of significance, what is the decision rule? (d) What is your conclusion in context of the problem? (Answer this question in a complete sentence(s) and include why, referring to the decision rule.) (e) Using the p-value approach, at the…
Assume that a simple random sample has been selected from a normally distributed population. Identify the null hypothesis, alternative hypothesis, test statistic, P-value (or range of P-value), critical value(s), conclusion about the null hypothesis, and final conclusion that addresses the original claim. Technology is dramatically changing the way we communicate. In 1997, a survey of 880 U.S households showed that 149 of them use e-mail. Use those sample results to test the claim that more than 15% of U.S. households use e-mail. Use a 0.01 significance level.
2. In a simple random sample of 1200 Americans age 20 and over, 138 of them were found to have Type I diabetes. Round all answers to three decimal places. a) Report a 95% confidence interval for the proportion of all Americans age 20 and over with diabetes. J b) According to the Centers for Disease Control and Prevention, nationally, 10.7% of all Americans age 20 and over have diabetes. Does the confidence interval you found support or refute this claim? Explain.
5. a). What is a fundamental difference between the t statistic and a z-score in terms of variability? b). What value is estimated with a confidence interval using the t statistic?
In the past the mean time it took a ten member crew to complete a particular job was, on average, u = 18.5 minutes with a standard deviation of o = 3 minutes; however, several crew members have been replaced and it appears that the mean time has increased. If you select a random sample of 30 performances by the crew, how large of a sample mean will you need to observe in order to reject the null hypothesis at the 5% level of significance? Show your methods. (Give your answer to the thousandth of a minute.) Your answer
Two confidence intervals, (119.4 Hz, 120.6 Hz) and (119.1 Hz, 120.9 Hz), are constructed for the mean resonance frequency (in Hz) for all tennis rackets of a certain type using the same sample data. Which interval represents the higher level of confidence? 9.
The dataset "nurses" is a random sample of 1,000 cases from “Health Care Provider Credential Data” from Washington State Open Data Portal. In the sample, there are 418 CNA's and 278 of the CNA's have expired credentials. Use the statistics from the nurses dataset to answer the following question: "With 90% confidence, what percent of all CNA's on Washington State's healthcare provider list are expired?"

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