A survey of 225 Statistics students showed that they spend an average of 5.2 hours studying...
A survey of 225 Statistics students showed that they spend an average of 5.2 hours studying for the class. Assume σ=.4.
a) Construct a 99% confidence interval to estimate the mean amount of time spent studying.
b) Interpret the confidence interval in the context of the problem.
Homework Answers
a) At 99% confidence level, the critical value is z0.005 = 2.58
The 99% confidence interval is
b) We are 99% confident that the true mean amount of time spent in studying lies in the above confidence interval.
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