X 9.2.32 Question Help A poll conducted in 1971 asked 1006 people, \"During the
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X 9.2.32 Question Help A poll conducted in 1971 asked 1006 people, "During the past year, about how many books, either hardcover or paperback, did you read either all or part of the way through?" Results of the survey indicated that x= 19.2 books and s= 20.2 books. (a) Construct a 95% confidence interval for the mean number of books read either all or part of during the preceding year. Interpret the interval. (b) Compare these results to a recent survey of 1006 people. The results of the survey indicated that x 13.2 books and s: 166 books. A 95% confidence interval for this survey is (12.17, 14.23). Were people reading more in 1971 than they are today? Click the icon to view the table of areas under the t-distribution. (a) The 95% confidence interval for 1971 is ( (Use ascending order. Round to two decimal places as needed.)Explanation / Answer
a)here std error of mean =std deviation/(n)1/2 =20.2/(1006)1/2 =0.637
for 95% CI and (n-=1=1005) degree of freedom t =1.9623
hence 95% conffidence interval for 1971 is =sample mean -/+ t*Std error =17.95 to 20.45
please reply for any clarification/other subparts.
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