A psychologist is interested in the conditions that affect thenumber of dreams per month that people report in which they arealone. We will assume that based on extensive previous research, itis known that in the general population the number of such dreamsper month follows a normal curve, with mean (μ) = 5 and standarddeviation (σ) = 4. The researcher wants to test the prediction thatthe number of such dreams will be greater among people who haverecently experienced a traumatic event. Thus, the psychologiststudies 36 individuals who have recently experienced a traumaticevent, having them keep a record of their dreams for a month. Theirmean number of alone dreams is 8. Should you conclude that peoplewho have recently had a traumatic experience have a significantlydifferent number of dreams in which they are alone? Carry out thefull five steps of hypothesis testing for a two-tailed test. Instep V, sketch the comparison distribution. Label the mean withboth a Z and a raw score. Draw in the significance level 0.05(cutoff) and label with Z-scores. Label the percent of the areacut-off. Indicate the position of the sample mean and label it withboth a Z and a raw score.

Step I: Restate the Question. Population 1:

Population 2 :

Research hypothesis :

Null hypothesis (2 points):

Step II: Give the characteristics of the comparison distribution.

Step III: Give the cut-off sample score(s) .

Step IV: Determine the sample score on the comparisondistribution .

Step V(a): Sketch the comparison distribution (cut-off &computed values) and give the decision .

  

Step V(b): Compute the 99% confidence intervals .

lower limit=

upper limit=