dict Mendel\'s theory? Why or why not? 21. Online Books A Consumer Reports Resea
ID: 3363044 • Letter: D
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dict Mendel's theory? Why or why not? 21. Online Books A Consumer Reports Research Center survey of 427 women showed that 29.0% of them purchase books online. a. Among the 427 women who were surveyed, what is the number of women who said that they purchase books online? b. Find a 95% confidence interval estimate of the percentage of all women who purchase books online. c. Can we safely conclude that less than 50% of all women purchase books online? Why or why not? d. Can we safely conclude that at least 25% of all women purchase books online? Why or why not? e. What do the results tell us about the percentage of men who purchase books online? 22, want Boss's Job? In a USA Today survey, 20.8% of 144 respondents said that they aspired to have their boss's job. Construct a 95% confidence interval estimate of thepercentage of all workers who aspire to have their boss's job. How are the results affected by the additional knowledge that the respondents chose to answer an online question posted on the USA Today Web site? 23, Job Interviews In a Harris poll of 514 human resource professionals, 45.9% said thatExplanation / Answer
Q.21 Number of women = 427
sample size N = 427
Percentage of people that purchase books online p^ = 0.29
(a) number of women who purchase books * 0.29 = 123.83 or say 124
(b) standard error of proportion se0 = sqrt[p^ *(1-p^)/N] = sqrt [0.29 * 0.71/427] = 0.02196
95% confidence interval =p^ +- Z95% se0 = 0.29 +- 1.96 * 0.02196
= (0.247, 0.333)
(c) Yes, we can safely conclude that less than 50% of all women purchase books online. As domain of 95% confidence interval values is less than 0.50. so, yes it is safe to assume.
(d) As the confidence interval consists the value of 0.25 so we cannot safely presume that at least 25% of all women purchase books online.
(e) THe results doesn't tell anything about men behaviour or how they purchase books.
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