Question: A researcher investigates whether or not a new cold medication disrupts mental alertness. It is known that scores on a standardized test containing a variety of problem-solving tasks are normally distributed with mean \(\mu \) = 64 and \(\sigma \) = 8. A random sample of n = 16 subjects are given the drug and then tested. For this sample, the mean is M = 58.
a. Compute t and determine if the data is sufficient to conclude that the medication affects performance? That is, Test with alpha = .01, two tails.
b. Compute Cohen's d to measure the size of the treatment effect.

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