Assume the sample is from a normally distributed population and construct the indicated confidence intervals...

Assume the sample is from a normally distributed population and construct the indicated confidence intervals for (a) the population variance ${\displaystyle {\sigma }^2}$ and (b) the population standard deviation σ. Interpret the results. The record high daily temperatures (in degrees Fahrenheit) of a random sample of 64 days of the year in Grand Junction, Colorado, have a sample standard deviation of 16.8∘F. Use a 98% level of confidence.