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Cold Medication Effect on Mental Alertness

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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 reaction time scores on the simulation task are normally distributed with the population mean = 210 and alpha = 20. The individuals in the sample had an average score of M = 222. Can the research conclude that the medication has a significant effect on mental alertness as measured by the driving simulation task? Use a two tailed test with alpha = 0.05. Compute Cohen's d to measure the size of the effect.

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Cold Medication Effect on Mental Alertness

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The null hypothesis tested is
H0: Mean reaction time scores on the simulation ...

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