Question

A psychologist is interested in the effect of CBT in patients admitted to a psychiatric hospital for schizophrenia. Below, these data were collected from 8 patients. The scores are a sum of delusional thoughts before and after CBT; lower scores indicate that less delusional thoughts were reported. Using a 0.05 level of significance to test whether CBT was successful as a treatment.

Patient	Pre CBT	Post CBT
1	31	24
2	29	25
3	22	20
4	26	25
5	30	29
6	35	31
7	29	26
8	28	25

• Research hypothesis: The effect on the CBT in patients admitted to a Psychiatric hospital for Schizophrenia will have less delusional thoughts after CBT.
• Null hypothesis: The effect on the CBT in patients admitted to a Psychiatric hospital for Schizophrenia will not have less delusional thoughts after CBT.
• Cutoff score: 1.895/2.365
• Output table:

Paired Samples T-Test
																95% Confidence Interval
						statistic		df		p		Mean difference		SE difference		Lower		Upper		Cohen's d
pre CBT		post CBT		Student's t		4.51		7.00		0.001		3.13		0.693		1.81		Inf		1.59
Note. Hₐ Measure 1 > Measure 2

• Write a final statement on what these data may indicate for patients.

Answer 1