The volleyball coach of CPU claimed that the players could jump higher than the players of USA. The players at CPU jumped 16, 18, 14, 19 and 18 inches respectively. The players at USA jumped 15, 10, 13, 14 and 11. Lie a-0.oS to test the null hypotheses that there is no difference in jumping heights between the CPU and USA players.
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- A golf instructor claims that more than 70% of his students have improved their driving distance by at least 20 yards after viewing and applying the techniques described in his instructional video. If 138 out of 180 viewers say that their driving distance has improved by at least 20 yards, is the instructor's claim valid? Identify the null and alternative hypotheses for this scenario. Is the instructor's claim that "more than 70% of his students have improved their driving distance by at least 20 yards," valid? Your response should include your decision and conclusion in context of the scenario.USA Today reported results from an Arity survey in which 2018 drivers were asked if they text while driving. Among the respondents, 42% said that they text while driving. What is the exact value that is 42% of the number of respondents? Could the result from part (a) be the actual number of respondents who said that they text while driving? Why or why not? What is the actual number of respondents who said that they text while driving? What do the results suggest about highway safety?A brokerage firm is curious about the proportion of clients who have high-risk stocks in their stock portfolio. Let the proportion of clients who have high-risk stocks be p. If the brokerage firm wants to know if the proportion of clients who have high-risk stocks is less than 15%, what are the null and alternative hypotheses?
- A poll conducted for Newsweek found that 13% of Americans have seen or sensed the presence of an angel. A contingent doubts that the percent is really that high, so they conducts their own survey. Out of 76 Americans surveyed, only two had seen or sensed the presence of an angel. As a result of the contingent's survey, do you agree with the Newsweek poll? Also, give three reasons why the two polls might give different results.A researcher selects a sample of international students and provides them with extra support to pursue their educational goals. The graduation rates for the sample is compared to the graduation rates for international students overall. In this study design, what are the null and alternative hypotheses? answer should be in the form of 2 complete sentences.The dean of a major university claims that the mean time for students to earn a Master's degree is at most 5.2 years. Write the null hypotheses.