How do you do longhand

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 $3.21. Assume the sample is taken from a normally distributed population. Construct 80% confidence intervals for (a) the population variance o and (b) the population standard deviation o. Interpret the results. (a) The confidence interval for the population variance is ( 6.76 , 19.02 ). (Round to two decimal places as needed.) Interpret the results. Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to two decimal places as needed.) O A. With 20% confidence, you can say that the population variance is greater than O B. With 80% confidence, you can say that the population variance is between and O C. With 80% confidence, you can say that the population variance is less than O D. With 20% confidence, you can say that the population variance is between and