The batting instructor of the Toronto Blue Jays would like to see whether playing ball in the winter (winter ball) has any effect on a player’s season batting average. He collects the following information on 6 players:

Use a dummy variable to test whether playing winter ball improves a player’s regular-season batting average.

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Player 1 2 234 in 6 5 Y Season batting average .300 .275 .250 .325 .265 .350 X Hours of batting practice 12 11 8 20 8 25 Played winter ball yes no no yes yes yes