Question: A replacement part for a machine must be produced with in close specifications in order for it to be acceptable to customers. Suppose the sample variance for 20 parts turns o u t to be s2 = 0.03.
a. Construct a 95% confidence interval of the population variance.
b. Production specifications call for a variance in the lengths of the parts to be exactly 0.05. Comment on whether or not the specification is being violated.