A researcher would like to determine whether an over-the-counter cold medication has an effect on mental alertness. A sample of n = 36 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 μ = 75 and σ = 10. The individuals in the sample had an average score of M = 71. 1). Can the researcher conclude that scores on the driving simulation task are significantly different after taking the medication? Use a two-tailed test with α = .05. 2). Can the researcher conclude that scores on the driving simulation task are significantly lower after taking the medication? Use a one-tailed test with α = .05. 3). Compute Cohen’s d to measure the size of the effect.
A researcher would like to determine whether an over-the-counter cold medication has an effect on mental alertness. A sample of n = 36 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
1). Can the researcher conclude that scores on the driving simulation task are significantly different after taking the medication? Use a two-tailed test with α = .05.
2). Can the researcher conclude that scores on the driving simulation task are significantly lower after taking the medication? Use a one-tailed test with α = .05.
3). Compute Cohen’s d to measure the size of the effect.
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