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# LEFTIES. IN A RANDOM SAMPLE OF MALES, IT WAS FOUND

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Author: Christine Farr
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Exercise Set 9.2 17. Lefties. In a random sample of males, it was found that 23 write with their left hands and 217 did not. In a random sample of females, it was found that 65 write with their left hands and 455 do not. We want to use a 0.01 significance level to test the claim that the rate if left-handedness among males is less than among females.a. Test the claim using a hypothesis test.b. Test the claim by constructing an appropriate confidence interval.c. Based on the results, is the left handedness among males less that the rate of left-handedness among females? Exercise Set 9.3 10. Do men and women have the same body temperature? Consider the sample of body temperature listed in the last column if Date Set 3 in Appendix B. The summary statistics are given in the accompanying table. Use a 0.01 significance level to test the claim that men and women have different body temperatures. Exercise Set 9.4 5. POTUS Hypothesis Test. Example 1 in this section used only five pairs of data from Data Set 12 in Appendix B for a 95% confidence level. Repeat Example 2 using all of the cases with heights for both the president and the main opponent. Results are shown in the accompanying XLSTAT display. Exercise Set 9.5 12. Skull Measurements from Different Times. Research measured skulls from different time periods in an attempt to determine whether interbreeding of cultures occurred. Results are given below. Use a 0.05 significance level to test the claim that variation of maximal skull breadths in 4000 B.C. is the same as the variation in A.D. 150.4000 B.C. (Maximal Skull Breadth): n = 30, x = 131.37 mm, s = 5.13 mmA.D. 150 (Maximal Skull Breadth): n = 30, x = 136.17 mm, s = 5.35 mm

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