Question: as part of a survey a marketing representative asks a...

As part of a survey, a marketing representative asks a random sample of 28 business owners how much they would be willing to pay for a website for their company She finds that the sample standard deviation is $3504. Assume the sample is taken from a normally distributed population. Construct 90% confidence intervals for (a) the population variance sigma^2 and (b) the population standard deviation sigma. Interpret the results