Intro to Stat_Part_33

Intro to Stat_Part_33 - 113 Exercise 7.15(Solution on p 119...

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113 Exercise 7.15 (Solution on p. 119.) The average length of a maternity stay in a U.S. hospital is said to be 2.4 days with a standard de- viation of 0.9 days. We randomly survey 80 women who recently bore children in a U.S. hospital. a. In words, X = b. In words, X = c. X ~ d. Question removed from text e. Question removed from text f. Is it likely that an individual stayed more than 5 days in the hospital? Why or why not? g. Is it likely that the average stay for the 80 women was more than 5 days? Why or why not? h. Which is more likely: i. an individual stayed more than 5 days; or ii. the average stay of 80 women was more than 5 days? Exercise 7.16 In 1940 the average size of a U.S. farm was 174 acres. Let’s say that the standard deviation was 55 acres. Suppose we randomly survey 38 farmers from 1940. (Source: U.S. Dept. of Agriculture) a. In words, X = b. In words, X = c. X ~ d. The IQR for X is from _______ acres to _______ acres. Exercise 7.17 (Solution on p. 119.) The stock closing prices of 35 U.S. semiconductor manufacturers are given below. (Source: Wall Street Journal ) 8.625; 30.25; 27.625; 46.75; 32.875; 18.25; 5; 0.125; 2.9375; 6.875; 28.25; 24.25; 21; 1.5; 30.25; 71; 43.5; 49.25; 2.5625; 31; 16.5; 9.5; 18.5; 18; 9; 10.5; 16.625; 1.25; 18; 12.875; 7; 2.875; 2.875; 60.25; 29.25 a. In words, X = b. i. x = ii.
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Intro to Stat_Part_33 - 113 Exercise 7.15(Solution on p 119...

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