Use Table VI in the Appendix and linear interpolation to approximate each critical value. Verify each approximation using technology. A personnel manager at Inserra Supermarkets is concerned about the...

Use Table VI in the Appendix and linear interpolation to approximate each critical value. Verify each approximation using technology.

A personnel manager at Inserra Supermarkets is concerned about the pattern of overtime hours claimed by employees. Although there is a special budget to pay for overtime hours, large fluctuations may cause cashflow problems. In a random sample of 25 employees, the sample variance for the number of overtime hours claimed was 4.25. Assume the distribution of overtime hours is normal.

a. Find a 95% confidence interval for the population variance of overtime hours.

b. Find a 95% confidence interval for the population standard deviation of overtime hours.