#27

Use technology to construct the confidence intervals for the population variance

2 and the population standard deviation . Assume the sample is taken from a normally distributed population.

c=0.99,

s=38,

n=19

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

_______________________________________________________________________________________________________________

# 29

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 $3.27. Assume the sample is taken from a normally distributed population. Construct 95%

confidence intervals for (a) the population variance 2 and (b) the population standard deviation .

Interpret the results.

(DO NOT FORGET TO INTERPRET THE RESULTS)