In a random sample of cell phones, the mean full retail price was $ and the standard deviation was $. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a % confidence interval for the population mean . Interpret the results. Identify the margin of error. 166.5 dollars (Round to one decimal place as needed.) Construct a % confidence interval for the population mean. (Round to one decimal place as needed.)