Warren County Telephone Company claims in its annual report that "the typical customer spends $60 per month on local and long-distance service." A sample of 12 subscribers revealed the following amounts spent last month. $69 $65 $65 $66 $60 $63 $68 $63 $56 $67 $67 $55 (a) What is the point estimate of the population mean? (Round your answer to 3 decimal places.) Population mean $ (b) Determine the 98% confidence interval for the population mean. (Round your answers to 2 decimal places.) Confidence interval $ and $