MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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- spam. You've heard that at least 65% of the email you recieve through a certain email account is marked You suspect this is incorrect, so you keep track of the emails you receive on that account for the next week. In that time, you received 57 emails and 29 of them were marked as spam. State the null and alternative hypotheses of this test. Null Hypothesis (Ho): Alternative Hypothesis (HA): p? P? V To test our hypothesis, we will assume that p = Is the success-failure condition of the Central Limit Theorem satisfied? O No. Either np a. O No. The result is not significant because the p-value isarrow_forward2. Suppose a 95% CI for the proportion of adults that regularly attend a tae kwon do class at least once a week was found to be (0.2534, 0.3894). decision a. For the null and alternative hypothesis: Ho: p = 0.40 versus Ha: p # 0.40, what is for this test of hypothesis? your b. Based on the CI, which of the following statements gives the best conclusion about the true value of the proportion of adults that regularly attend a tae kwon do class at least once a week? i. I am 95% confident that the proportion of adults that regularly attend a tae kwon do class at least once a week is greater than 40%. ii. I am 95% confident that the proportion of adults that regularly attend a tae kwon do class at least once a week is different than 40% iii. I am 95% confident that the proportion of adults that regularly attend a tae kwon do class at least once a week is less than 40% iv. I am 95% confident that the proportion of adults that regularly attend a tae kwon do class at least once a week equals…arrow_forwardAccording to MessageLabs Ltd., 80% of all email sent in July 2010 was spam. A system manager at a large corporation believes that the percentage at his company may be greater than 80%, and he wants to run a hypothesis test to see if there is evidence to support his belief. He examines a random sample of 500 emails received at an email server and finds that 420 of the messages are spam. Calculate the test statistic. Keep as many decimal places as you can when you are working with the denominator. Round the final answer to two decimal places.arrow_forwardA statistics professor wants to see if more than 80% of her students enjoyed her class. At the end of the term, she takes a random sample of students from her large class and asks, in an anonymous survey, if the students enjoyed taking her class. A p-value of o.12 in this problem indicates.. A 12% of students in teh sample enjoyed the class. there's a 12% chance that under 80% of all students enjoyed the olass. C there's a 12% chance that over 80% of all students enjoyed the class. D If it is true that 80% of all students enjoyed the class, there's only E 12% chance she d see this higha rate in her sample. 8. 9. 10 11 12 13 14 15 16 17 B.arrow_forwardProbability is an important concept for researchers primarily because a. it is used to compare data collected from samples to the population b. it is used to develop statistical hypotheses such as the null hypothesis and alternative hypothesis c. most research involves flipping coins and pulling aces out of a deck of cards. d. it is used to prove a study’s research hypothesesarrow_forwardQUESTION 1 An executive believes that no more than 80% of the company’s employees take all of their vacation days. When testing the executive's hypothesis (using a 1% level of significance), what is the null and alternative hypothesis?arrow_forwardA decade-old study found that the proportion of high school seniors who felt that "getting rich" was an important personal goal was 71%. Suppose that we have reason to believe that this proportion has changed, and we wish to carry out a hypothesis test to see if our belief can be supported. State the null hypothesis H0 and the alternative hypothesis H1 that we would use for this test.arrow_forwardA decade-old study found that the proportion of high school seniors who felt that "getting rich" was an important personal goal was 097%. Suppose that we have reason to believe that this proportion has changed, and we wish to carry out a hypothesis test to see if our belief can be supported. State the null hypothesis H and the alternative hypathesis A that we would use for this test. H 0 H:0 ?arrow_forwardD Country Financial, a financial services company, uses surveys of adults age 18 and older to determine whether personal financial fitness changing over time. A recent sample of 1000 adults showed 410 indicating that their financial security was more than fair. Just a year prior, a sample of 900 adults showed 315 indicating that their financial security was more than fair. a. State the hypotheses that can be used to test for a significant difference between the population proportions for the two years. Ho : P1 – p2- Select your answer - Ha : Pi - P2 - Select your answer - b. Conduct the hypothesis test and compute the p-value. Round your answer to four decimal places. p-value = %3D At a = 0.05 level of significance, what is your conclusion? I. Reject Ho. There is not sufficient evidence to conclude that the population proportions are not equal. The data do not suggest that there has been a change in the population proportion saying that their financial security is more than fair. II.…arrow_forwardA popular phone company states that teens only use their phones for 1.5 years or less before upgrading to a new phone. Your mother believes that teens only upgrade after 1.5 years. State the null and alternative hypothesis for the scenario using math symbols and words.arrow_forwardAccording to the most recent General Social Survey, 70% of adults watch TV nightly. A researcher believes that the proportion of college students who watch TV nightly is less than this. To test this claim the research samples 400 college students and finds that 276 watch TV nightly. At the 0.05 level of significance does this data provide evidence to suggest that the proportion of college students who watch TV nightly is less than 70%? Select the correct hypothesis test for this problem:arrow_forwardAccording to the Centers of Disease Control, about 21% of American young people between the ages of 12 and 19 are obese. A student claims that the students his local schools are in better shape than the national average, so their proportion of obese students is less than 21%. Which are the appropriate null and alternative hypotheses for this study? Họ: p = 21%, H1: p = 21% Ho: p × 0, Hq: p = 0 Họ: p = 21%, Hq: p > 21% Họ: p = 21%, H,: p < 21% Suppose tnat the result of the statistical is to fail to reject Ho. Which is the proper conclusion? O There is not sufficient evidence to conclude that the students at his local schools have a smaller true proportion of obese students. O There is sufficient evidence to conclude that the students his local schools have a smaller true proportion of obese students. O There is not sufficient evidence to conclude that the students at his local schools have a smaller sample proportion of obese students. O There is sufficient evidence to conclude that…arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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