The annual earnings of 12 randomly selected computer software engineers have a sample standard deviation of $3705. Assume the sample is from a normally distributed population. Construct a confidence...

The annual earnings of 12 randomly selected computer software engineers have a sample standard deviation of $3705.

Assume the sample is from a normally distributed population. Construct a confidence interval for the population variance σ2 and the population standard deviation σ.

Use a 90% level of confidence. Interpret the results.