
A researcher is testing the hypothesis that consuming a sports drink during exercise improves endurance. A sample of n=49 college students is obtained and each student is given a series of three endurance tasks and asked to consume 4 ounces of the drink during each break between tasks. The overall endurance score for this sample is M =52. For the general population of male college students, without any sports drink, the scores for this task average µ = 50 with a standard deviation of σ = 14.
Are the endurance scores with the sports drink significantly higher than endurance scores without the drink ? Use a one-tailed test with α=.01
citical z value= 2.33
z statistic= 1
Your decision is

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