George Johnson is the head coach of a college football team that trains and competes at home on artificial turf. George is concerned that the 40-yard sprint time recorded by his players and others increases substantially when running on natural turf as opposed to artificial turf. If so, there is little comparison between his players’ speed and that of their opponents whenever his team plays on grass. The next opponent of George’s team plays on grass, so he surveyed all the starters in the next game and obtained their best 40-yard sprint times. He then compared them with the best times turned in by his own players. The results are shown in the table that follows:
Do Coach Johnson’s players have a lower mean sprint time? Assuming normality, test at the 0.05 level of significance to advise Coach Johnson.
a. Solve using the p-value approach.
b. Solve using the classical approach.

  • CreatedAugust 28, 2015
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