Question: A researcher studies the effect of a Monoamine-oxidase inhibitor (MAOI) drug on the number of nightmares occurring in veterans with Post-traumatic Stress Disorder (PTSD). The researcher asks a sample of PTSD clients to record each incident of a nightmare for 1 month before treatment. Participants are then given the medication for 1 month, and they continue to report each occurrence of a nightmare. Use the following hypothetical data for Q4 and Q5. Number of Nightmares 1 Month Before Treatment 6,10,3,5,7 1 Month During Treatment 1, 2, 0, 5, 2 Q4) Use the dataset above to calculate each of the following statistics for “Number of Nightmares”: a) Difference score for each case within the data set. (A “case” is a corresponding pair of scores) b) Mean difference score c) Standard error of the sampling distribution Q5) Use the statistics calculated in Q3 to conduct a hypothesis test to determine whether the MAOI significantly reduces nightmares in the veteran sample. Perform a hypothesis test with an alpha level of .05 and a two-tailed design (show all 5 steps of hypothesis testing).