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? https www.mathxl.com Student PayerHomework.aspx?homeworldd-487000874&a; estioni Q,Search 110% Ambrosc Ayalo 721/18 1244 AM MAT-240-X6783 Applied Statistics 18EW6 Homework: 3-2 MyStatLab: Module Three Problem Set Save Score: 0 of 5 pts 12 of 14 (12 complete) ? HW Score: 76.92%, 50 of 65 p 9.2.32 E Question Help A poll conducted in 1971 asked 1004 people "During the past year, about how many books, e er har cover or paperback did you read either all or part ofthe wa o n?" Res sof he sur y dicated atx i o sana s 1,6 00 (a) Construct a 99% confidence interval for the mean number of books read either all or part ot duringthe preceding year interpret the interval b) Compare these results to a recent survey of 1004 people. The results o the survey indicated that x= 12.9 books and s-16.4 book A 99% confidence n erval or this survey ?s 11.56 14.24). 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 99% confidence interval for 1971 is( (Use ascending order. Round to two decimal places as needed.) CD.

Explanation / Answer

The statistical software output for this problem is:

One sample T summary confidence interval:
? : Mean of population

99% confidence interval results:

Hence,

a) 99% confidence interval for 1971 is:

(17.00, 20.20)

Mean Sample Mean Std. Err. DF L. Limit U. Limit ? 18.6 0.61857052 1003 17.00363 20.19637

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