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...

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 $3.16. Assume the sample is taken from a normally distributed population. Construct 90​% confidence intervals for​ (a) the population variance σ2 and (b) the population standard deviation σ.
Interpret the results.