A study is done by a community group in two neighboring colleges to determine which one graduates students with more math classes. College A samples 31 graduates. Their average is four math classes with a standard deviation of 1.5 math classes. College B samples 47 graduates. Their average is 3.5 math classes with a standard deviation of 1 math class.
a)Construct 90% confidence interval on the difference between the two colleges and explain what it means in the context of the problem.
b) Construct 90% confidence interval on the difference between the two colleges and explain what it means in the context of the problem.
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