Question: A researcher would like to estimate how much reaction time is affected by a common over-the-counter cold medication. The researcher measures reaction time for a sample of n = 36 participants. Each is then given a dose of the cold medication and reaction time is measured again. For this sample, reaction time increased after the medication by an average of MD = 24 milliseconds with s = 8.

a. Make a point estimate of the mean difference in reaction time caused by the medicine.

b. Make a 95% confidence interval estimate of the population mean difference.