Sales personnel for RH Educational Systems submit weekly reports listing the customer contacts made during the week. A sample of 65 weekly reports showed a sample mean of 19.5 customer contacts per week. The sample standard deviation was 5.2.
1. Determine a 90% confidence interval for the population mean number of weekly customer contacts for the sales personnel.
2. Determine a 95% confidence interval for the population mean number of weekly customer contacts for the sales personnel.