The grades of a sample of 5 students, selected from a large population, are given below.
a. Determine a point estimate for the variance of the population.
b. Determine a 95% confidence interval for the variance of the population.
c. At 90% confidence, test to determine if the variance of the population is significantly more than 50.
The expert examines the confidence intervals for a population variance. A complete, neat and step-by-step solution is provided in the attached file.