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Four Brands of Baseball Bats Were Tested to Determine Which

Question 71

Multiple Choice

Four brands of baseball bats were tested to determine which bat allowed hitters to hit a baseball farthest. Eight different batters were thrown 25 pitches while hitting with each of the four bats
(assigned in random order) . The average distance of the five longest hits using each bat is shown
In the table below. The goal is to determine if the average hit distance differs for the four brands of
Baseball bats.  Batter  Brand 1  Brand 2  Brand 3  Brand 4 13073153002752310317305285333533533030243253283203005300305295270634535034031073123153083008298302295288\begin{array}{c|c|c|c|c}\text { Batter } & \text { Brand 1 } & \text { Brand 2 } & \text { Brand 3 } & \text { Brand 4 } \\\hline 1 & 307 & 315 & 300 & 275 \\2 & 310 & 317 & 305 & 285 \\3 & 335 & 335 & 330 & 302 \\4 & 325 & 328 & 320 & 300 \\5 & 300 & 305 & 295 & 270 \\6 & 345 & 350 & 340 & 310 \\7 & 312 & 315 & 308 & 300 \\8 & 298 & 302 & 295 & 288\end{array}

The ANOVA table output is shown here:
 Source  DF  SS  MS  F  P  Batter 76227.4946.7739.700.0000 Brand 34117.61372.5457.550.0000 Error 21500.923.85 Total 3111245.9\begin{array}{c|c|c|c|c|c}\text { Source } & \text { DF } & \text { SS } & \text { MS } & \text { F } & \text { P } \\\hline \text { Batter } & 7 & 6227.4 & 946.77 & 39.70 & 0.0000 \\\text { Brand } & 3 & 4117.6 & 1372.54 & 57.55 & 0.0000 \\\text { Error } & 21 & 500.9 & 23.85 & & \\\text { Total } & 31 & 11245.9 & & &\end{array}

Based on the p-value for this test, make the proper conclusion about the treatments in this experiment.


A) There is insufficient evidence (at α=0.01\alpha = 0.01 ) to indicate differences among the mean distances for the eight batters.
B) There is sufficient evidence (at α=0.01\alpha = 0.01 ) to indicate differences among the mean distances for the eight batters.
C) There is sufficient evidence (at α=0.01\alpha = 0.01 ) to indicate differences among the mean distances for the four brands of baseball bats.
D) There is insufficient evidence (at α=0.01\alpha = 0.01 ) to indicate differences among the mean distances for the four brands of baseball bats.

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