Question

Dr. Grey wanted to see if doctors prescribed different treatments for OCD for male patients compared to females. Please use the following frequency tables for the data collected by Dr. Grey. SHOW ALL STEPS PLEASE

Contingency table of Observed and Expected Frequencies of the different treatments (Drug vs. Cognitive Therapy) prescribed for patients with OCD.
Therapy Totals		Drug		Cognitive Therapy		Total
Gender of Patient		Observed	Expected	Observed	Expected
	Man	20		10		30
	Woman	15		15		30
	Total	35		25		60

What is your Conclusion - APA statistic?

A) χ2(1) = X.XX, p > .05

B) χ2(2) = X.XX, p < .05

C) χ2(2) = X.XX, p > .05

D) χ2(1) = X.XX, p < .05

Answer 1

Ans:

Expected count=row sum*column sum/overall sum

	Observed(fo)
	Drug	Cognitive Therapy	Total
Man	20	10	30
Woman	15	15	30
Total	35	25	60
	Expected(fe)
	Drug	Cognitive Therapy	Total
Man	17.5	12.5	30
Woman	17.5	12.5	30
Total	35	25	60
	Chi square=(fo-fe)^2/fe
	Drug	Cognitive Therapy	Total
Man	0.357	0.5	0.857
Woman	0.357	0.5	0.857
Total	0.714	1.000	1.714

Test statistic:

Chi square=1.714

df=(2-1)*(2-1)=1

p-value=CHIDIST(1.714,1)=0.1905

Option A is correct.