A researcher is testing the hypothesis that consuming a sports drink during exercise improves endurance. A...
A researcher is testing the hypothesis that consuming a sports drink during exercise improves endurance. A sample of n = 36 male 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 = 85. For the general population of male college students, without any sports drink, the scores for this task average u = 80 with a standard deviation of a = 12. Can the researcher conclude that endurance scores with the sports drink are significantly higher than scores without the drink? Use a one-tailed test with a = .01.
z-critical ± =
z=
The results indicate:
Fail to reject the null hypothesis, there is no significant increase in endurance scores.
Fail to reject the null hypothesis, there is a significant difference in endurance scores.
Reject the null hypothesis, there is a significant increase in endurance scores.
Reject the null hypothesis, there is no significant difference in endurance scores.
Can the researcher conclude that endurance scores with the sports drink are significantly different than scores without the drink? Use a two-tailed test with a = .01.
z-critical ± =
Conclusion:
Reject the null hypothesis, there is a significant difference in endurance scores.
Fail to reject the null hypothesis, there is a significant increase in endurance scores.
Fail to reject the null hypothesis, there is no significant difference in endurance scores.
Reject the null hypothesis, there is no significant increase in endurance scores.
Why would the two tests lead to different conclusions?
The two-tailed test requires a larger z-score for the sample to be in the critical region.
The one-tailed test requires a larger z-score for the sample to be outside the critical region.
The two-tailed test requires a larger z-score for the sample to be outside the critical region.
The one-tailed test requires a larger z-score for the sample to be in the critical region.
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