5. When comparing the t-distribution (eg. For n 20) with the z-distribution it is TRUE to say (a) they are both standard normal curves (b) the variances for both distributions are the same (c) they...

Extracted text: 5. When comparing the t-distribution (eg. For n 20) with the z-distribution it is TRUE to say (a) they are both standard normal curves (b) the variances for both distributions are the same (c) they have the same mean but the t distribution has variability so more probability in the tails the t distribution has a smaller standard deviation than Z (d)