Confidence Interval for Mean Predicted Value Example 1 in this section illustrated the procedure for finding a prediction interval for an individual value of y. When using a specific value x0 for predicting the mean of all values of y, the confidence interval is as follows:

The critical value ta>2 is found with n - 2 degrees of freedom. Using the 147 pairs of pulse rates and white blood cell counts of females in Data Set 1 “Body Data” in Appendix B, find a 95% confidence interval estimate of the mean white blood cell count given that a female has a pulse rate of

(a) 80 beats per minute and

(b) 70 beats per minute.

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