Because of staffing decisions, managers of the a certain hotel are interested in the variability in the number of rooms occupied per day during a particular season of the year. A sample of 25 days of operation shows a sample mean of 300 rooms occupied per day and a sample standard deviation of 30 rooms. (a) What is the point estimate of the population variance? (b) Provide a 90% confidence interval estimate of the population variance. (Round your answers to the nearest integer.) to (c) Provide a 90% confidence interval estimate of the population standard deviation. (Round your answers to one decimal place.) to