A random sample of n = 10 flash light batteries with a mean operating life X=5 hr. And a sample standard deviation S = 1 hr. is picked from a production line known to produce batteries with normally distributed operating lives. What's the 98% confidence interval for the unknown mean of the working life of the entire population of batteries?
Small Sample Confidence Interval for the Mean test
4.1078 < u < 5.8922
Small Sample Confidence Interval for the Mean test
4.1078 < u < 5.8922