Stats Confidence Intervals 6

1. ConfidenceInterval, is not known or n<30.

   For a group of 20 students taking a final exam, the mean heartrate was 96 beats per minute and the standard deviation was 5.  Find the95% confidence interval of the true mean.

1. Find the criticalvalue

2. Find the margin oferror:  E =

3. Find the confidence interval:CI =

Writethe conclusion.