A sample of 20 pages was takenwithout replacement from the 1,591-page phone dire

Question

A sample of 20 pages was takenwithout replacement from the 1,591-page phone directoryAmeritech Pages Plus Yellow Pages. On each page, the meanarea devoted to display ads was measured (a display ad is a largeblock of multicolored illustrations, maps, and text). The data (insquare millimeters) are shown below:

Construct a 95 percent confidenceinterval for the true mean. (Round your answers to 2decimal places.)

Explanation / Answer

x-bar=346.5 , s=170.38 =0.05, Z(0.025)=1.96 (check normal table) The 95% CI is x-bar±1.96*s/n-->346.5±1.96*170.38/20 -->(271.83, 421.17)

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