A researcher conducted a study to investigate the effect of caffeine on work pro

Question

A researcher conducted a study to investigate the effect of caffeine on work productivity. He had 20 subjects complete math problems for 5 min. Then all 20 subjects drank two cups of coffee and completed math problems again for 5 min. The researcher believes that drinking the caffeine in the coffee will result in more problems solved in the 5 min period Q34. The researcher runs the correct test with ar alpha level of 0.05. He finds that the observed test statistic from the sample is 2.58. If the critical value of the test statistic is 2.26, the researcher should: Fail to reject HO O Reject Ho O Re-run this test because these values indicate that an error was made Cannot determine

Explanation / Answer

The correct answer is Option B. Since the calculated t statistic (2.58) is greater than the critical value (2.26), we can reject our null hypothesis.

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