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Fed-Ex claims that the variance of their 2-day package delivery is less than 0.75 days. A...

Fed-Ex claims that the variance of their 2-day package delivery is less than 0.75 days. A simple random sample of 24 deliveries showed a sample variance s2 = 0.81 days.

(a) Test the Fed-Ex claim at 95% confidence level.

(b) Construct a 95% Interval Estimate for population variance for the 2-day delivery times.

Math   Statistics-And-Probability   
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