1. A researcher examines whether an over-the-counter cold medication influences mental alertness of prison wardens. A random sample of n = 16 participants is obtained, and each person is given a standard dose of the medication one hour before being tested on a simulation task. For the general population, scores on the simulation task are normally distributed with = 60 and = 8. The individuals in the sample had an average score of M = 56.

	Answer
What is the population?
What is the sample?
Does this study meet the assumption of scale of measurement? Why or why not?
Does this study meet the assumption of sampling distribution is normal? Why or why not?
For this study what is the null hypothesis?
Can the researcher conclude that scores on the driving simulation task are significantly different after taking the medication? Use a two-tailed test with = 0.05
Using the two-tailed test with = 0.05 compute Cohen's d and interpret the size of the effect.
Can the researcher conclude that scores on the driving simulation task are significantly lower after taking the medication? Use a one-tailed test with = 0.01.