A magazine includes a report on the energy costs per year fo

A magazine includes a report on the energy costs per year for 32-inch liquid crystal display (LCD) televisions. The article states that 14 randomly selected 32-inch LCD televisions have a sample standard deviation of $3.88 Assume the sample is taken from a normally distributed population. Construct 80% confidence intervals for (a) the population variance sigma squared 2 and (b) the population standard deviation sigma . Interpret the results.

(a) The confidence interval for the population variance is .( , ). (Round to two decimal places as needed.)

Solution