A researcher would like to determine whether an over-the-counter cold medication has an effect on mental alertness. A sample of n = 16 participants is obtained, and each person is given a standard dose of the medication one hour before being tested in a driving simulation task. For the general population, scores on the simulation task are normally distributed with m = 60 and s = 8. The individuals in the sample had an average score of M = 56.5. a.  Can the researcher conclude that scores on the driving simulation task are significantly different after taking the medication? Conduct the four steps in Hypothesis testing and label each step.  Use a two-tailed test with a = .05. Write your decision in the form of a sentence. b. Can the researcher conclude that scores on the driving simulation task are significantly lower after taking the medication? Conduct the four steps in Hypothesis testing and label each step.  Use a one-tailed (critical region) test with a = .05. Write your decision in the form of a sentence. c. Compute Cohen’s d to measure the size of the effect.

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A researcher would like to determine whether an over-the-counter cold medication has an effect on mental alertness. A sample of n = 16 participants is obtained, and each person is given a standard dose of the medication one hour before being tested in a driving simulation task. For the general population, scores on the simulation task are normally distributed with m = 60 and s = 8. The individuals in the sample had an average score of M = 56.5.


a.  Can the researcher conclude that scores on the driving simulation task are significantly different after taking the medication? Conduct the four steps in Hypothesis testing and label each step.  Use a two-tailed test with a = .05. Write your decision in the form of a sentence.


b. Can the researcher conclude that scores on the driving simulation task are significantly lower after taking the medication? Conduct the four steps in Hypothesis testing and label each step.  Use a one-tailed (critical region) test with a = .05. Write your decision in the form of a sentence.

c. Compute Cohen’s d to measure the size of the effect.  

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