What is the test statistic?

The mean speeds of fastball pitches from two different baseball pitchers are to be compared. A sample of 14 fastball pitches is measured from each pitcher. The populations have normal distributions. Table 10.8 shows the result. Scouters believe that Rodriguez pitches a speedier fastball.

Transcribed Image Text:

Sample Mean Speed of Pitches (mph) Pitcher Wesley 86 Rodriguez 91 Table 10.8 Population Standard Deviation 3 7