Brant is preparing for the upcoming track season, and he wants to reduce the time of his 1-mile run. Last year, he conducted an experiment to judge the effectiveness of two training programs: Q30X and Intensity. He randomly selected 10 of his competitors and asked 5 of them to use the Q30X program and 5 of them to use the Intensity program.
To test the effectiveness of the programs, Brant compared their average 1-mile run time after using the program to their average 1-mile run time before using the program. He found that those who used the Q30X program improved their average 1-mile run time by 5% and those who used the Intensity program improved their average 1-mile run time by 7%.
Which of the following statements properly describes the results of Brant's experiment?
A.
The Q30X program and the Intensity program are both effective because the average participant 1-mile run time was reduced for each program, but the Intensity program is the more effective program because it yielded a greater decrease in the average participant 1-mile run time.
B.
The Q30X program is the only effective program because the average participant 1-mile run time had the greatest decrease, but the Intensity program is not effective because it yielded a smaller decrease in the average participant 1-mile run time.
C.
The Q30X program and the Intensity program are both effective because the average participant 1-mile run time was reduced for each program, but the Q30X program is the more effective program because it yielded a greater decrease in the average participant 1-mile run time.
D.
The Intensity program is the only effective program because the average participant 1-mile run time had the greatest decrease, but the Q30X program is not effective because it yielded a smaller decrease in the average participant 1-mile run time.