A sports writer wished to see if a football filled with helium travels farther, on average, than a football filled with air. To test this, the writer used 18adult male volunteers. These volunteers were randomly divided into two groups of 9 subjects each. Group 1 kicked a football filled with helium tothe recommended pressure. Group 2 kicked a football filled with air to the recommended pressure. The mean yardage for group 1 was x_bar1 =30 yards, with a standard deviation s, = 8 yards. The mean yardage for group 2 was x_bar2 = 26 yards, with a standard deviation s, = 6 yards.Assume the two groups of kicks are independent. Let u1 and u2 represent the mean yardage we would observe for the entire populationrepresented by the volunteers if all members of this population kicked, respectively, a helium and an airfilled football. Assume that two-sample t-procedures are safe to use. Suppose the researcher had wished to test the hypotheses. Suppose the researcher had wished to test thehypothesesH,: H, = 2, Ha:P,>The P-value for the test is (use the conservative Approach)Select one:O a. between 0.05 and 0.01.O b. below 0.01.O c. between 0.10 and 0.05.O d. larger than 0.10.

The p value are used to measure the significance difference the sample and population. We can also…

Answered: A sports writer wished to see if 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 manufacturer of a battery claims that the mean life of it is 8 months. An agency took a sample of 40 such batteries with a mean life of 7 months and a standard deviation of 2.25 month. Using 10% significance level, is there sufficient evidence to reject the claim?
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A recent study compared the time spent together by single- and dual-earner couples. According to the records kept by the wives during the study, the mean amount of time spent together watching television among the single-earner couples was 61 minutes per day, with a standard deviation of 15.5 minutes. For the dual-earner couples the mean number of minutes spent watching television was 48.4 minutes, with a standard deviation of 18.1 minutes. At the .01 significance level, can we conclude that the single-earner couples on average spend more time watching television together? Fifteen single-earner and 12 dual-earner couples were studied. MUST USE CRITICAL VALUE, NO P VALUE AND NO EXCELL ALL WORK
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