Confidence Interval for a Mean using StatCrunch

If you are given summary data and asked to find a confidence interval, it is relatively easy using StatCrunch. Here is a typical problem: In this problem, you are told to use the t-distribution, but that may not always be the case. If you are given the sample standard...

Degrees of Freedom

For the present, yes, the degrees of freedom you need to find values of t are going to be equal to n-1. That’s all you need to know for the midterm. Later in the course, things will get more complicated re degrees of freedom. Let me try to give a short...