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 μ = 60 and σ = 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? Use a two-tailed test with α = .05.
b.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.
c.Compute Cohen's d to measure the size of the effect.

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The Answer of 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 μ = 60 and σ = 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? Use a two-tailed test with α = .05.
b.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.
c.Compute Cohen's d to measure the size of the effect.

A Researcher Would Like to Determine Whether an Over-The-Counter Cold