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Warren County Telephone Company claims in its annual report that "the typical customer spends $61 per month on local and long-distance service." A sample of 12 subscribers revealed the following amounts spent last month. $64 $66 $64 $69 $60 $64 $69 $62 $63 $66 $54 $63

(a) What is the point estimate of the population mean? (Round your answer to 3 decimal places. Omit the "tiny_mce_markerquot; sign in your response.) Estimated population mean $

(b) Develop a 98 percent confidence interval for the population mean. (Round your answers to 3 decimal places. Omit the "tiny_mce_markerquot; sign in your response.) Confidence interval for the population mean $ and $

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