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).