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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 μ = 210 and σ = 20. The individuals in the sample had an average score of M = 222.
a. 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 α = .05.
b State the alternative Hypothesis in words and symbols.
Effect
Direction
Size of Effect
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