Among all Major League Baseball players, the mean speed of a four-seam fastball is 93.58 miles per hour (mph). The following data represent a random sample of four-seam fastballs thrown by David Price.

(a) Draw a boxplot of the data. Does the boxplot suggest that it is appropriate to use Student’s t-distribution to determine the P-value?
(b) Does the sample data suggest that David Price has a slower speed on his four-seam fastball? Use the α = 0.05 level of significance.

Transcribed Image Text:

93.6 92.3 93.4 92.2 91.4 94.1 93.7 91.5 93.2 91.6 90.6 94.0 93.3 93.3 93.9 92.7 92.3 90.4 91.8 92.5