The Sport Journal (Winter 2004) reported on a study of

The Sport Journal (Winter 2004) reported on a study of a speed-training program for high school football players. Each participant was timed in a 40-yard sprint both before and after training. The researchers measured two variables: (1) the difference between the before and after sprint times (in seconds), and (2) the category of improvement (“improved,” “no change,” and “worse”) for each player.
a. Identify the type (quantitative or qualitative) of each variable measured.
b. A total of 14 high school football players participated in the speed-training program. Does the data set collected represent a population or a sample? Explain.

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