a) A financial officer for a company wants to estimate the percent of accounts receivable that are more than 30 days overdue. He surveys 200 accounts and finds 131 are more than 30 days overdue. Compute a 90% confidence interval for the true proportion of accounts receivable that are more than 30 days overdue. b) A commuter travels many kilometres to work each morning. She has timed this trip 8 times during the last month to record the following sample (in minutes) showing the time required to make the trip each time: 41, 34, 42, 57, 32, 39, 38, 39 Construct a 95% confidence interval to estimate the population mean time the commuter takes travelling to work in the morning.

a) A financial officer for a company wants to estimate the percent of accounts receivable that are more than 30 days overdue. He surveys 200 accounts and finds 131 are more than 30 days overdue. Compute a 90% confidence interval for the true proportion of accounts receivable that are more than 30 days overdue. b) A commuter travels many kilometres to work each morning. She has timed this trip 8 times during the last month to record the following sample (in minutes) showing the time required to make the trip each time: 41,34,42,57,32,39,38,39 Construct a 95% confidence interval to estimate the population mean time the commuter takes travelling to work in the morning