Mathematical
10. PRACTICE L Be Precise Gretchen measured the
length of her toaster to the nearest half inch to be
9 inches. Steve measured the toaster to the nearest
quarter inch and found that it measured 9 inches.
Who used a more precise measurement?

Sales personnel for skillings distributors submit weekly reports listing the customer contacts made during the week. a sample of 55 weekly reports showed a sample mean of 17.5 customer contacts per week. the sample standard deviation was 5.8. provide 90% and 95% confidence intervals for the population mean number of weekly customer contacts for the sales personnel. a. 90% confidence interval, to 2 decimals b. 95% confidence interval, to 2 decimals