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4. A sample of nine fastballs thrown by a certain pitcher were measured at speeds of...

4. A sample of nine fastballs thrown by a certain pitcher were measured at speeds of 94, 87, 80, 91, 85, 102, 85, 80, 93 miles per hour.

a. What is the point estimate of the mean speed of this pitcher’s fastball?

b. What is the margin of error when estimating the mean speed if using 95% confidence.

c. Construct a 95% confidence interval estimate of the mean speed. Assume the distribution is normal.

Math   Statistics-And-Probability   
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