stats- confidence intervals

1. Confidence Interval, is not known or n<30.

   For a group of 20 students taking a final exam, the mean heart rate was 96 beats per minute and the standard deviation was 5.  Find the 95% confidence interval of the true mean.

1.  Find the critical value

2.  Find the margin of error:  E =

3.  Find the confidence interval: CI =

Write the conclusion.