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Question

xM MHE Reader MHE Reader ttps://newconnect mheducation.comtlowfconnect htm omework 6 Warren County Telephone Company claims in its annual report that the typical customer spends $62 per month on local and long-distance service A sample of 12 subscribers revealed the following amounts spent last month 954 566 564 559 559 $65 568 $62 564 558 S5 a. What is the point estimate of the population mean? (Round your answer to 3 decimal places.) Estimated population b. Develop a 98% confidence interval forthe population mean, iuse tDarbution Table ) (Round your answers to 3 decimal places.) Confidence interval for the population mean is the company's claim that the Typical customer spends 562 per month reasonable? Yes E 101

Explanation / Answer

Solution:- Given that 64,66,64,69,59,65,68,62,64,68,53,66

a. Estimated population mean = $64

b. Given a=0.02, t=(0.01, df=n-1=11) =2.72 (from student t table)

So 98% confidence interval is

xbar +/-t*s/sqrt(n)

--> 64 +/- 2.72* 4.431/sqrt(12)

--> (60.521, 67.479)

c) option A. Yes

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