Question: Practice problem for module 2 A random sample of 50 students GPA reveals that the mean GPA is 2.8 years with a standard deviation of

Practice problem for module 2

A random sample of 50 students GPA reveals that the mean GPA is 2.8 years with a standard deviation of 0.45 years. (a) Construct a 95% Confidence Interval for the mean lifetime of all LED TV.

(b) If we want to be 90% confident, and we want to control the maximum error of estimation to be 0.2, how many more students should be added into the given sample?

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