The lifetimes of 10 light bulbs (in hours burned) were recorded as follows:
51, 62, 45, 56, 73, 71, 63, 58, 59, 54
Assume the lifetime of a light bulb comes from a normal distribution.
a. Estimate the population variance (sigma^2) .
b. Compute a 99 percent two-sided confidence interval for population variance (sigma^2).
c. Compute a value V that enables us to state, with 90 percent confidence, that population variance (sigma^2) is less than V.