Question

A study was conducted for patient with fear of snakes. Four treatments were given

1st was model handled a snake and had the patient imitate

2nd was made to watch a film of kids handeling a king snake

3rd desenitization therepy

4th was a control and was given no treatment

Name the independent and its variables. Name the dependent variables

Compute SS tot, SS treat, and SS error

model

29

27

27

21

Film

22

18

17

15

Desensitization

21

17

16

14

Control

13

12

9

6

Answer 1

in the given problem, we have to fit one way ANOVA model.

dependent variable is- No. of patient with fear of snakes

treatment variable- we have 4 different level of treatment

1-model handled a snake

2-watch a film

3-Desensitization

4-Control

now we fit a ANOVA model using excel

output of excel is-

Anova: Single Factor

SUMMARY
Groups	Count	Sum	Average	Variance
Column 1	4	104	26	12
Column 2	4	72	18	8.666666667
Column 3	4	68	17	8.666666667
Column 4	4	40	10	10

ANOVA
Source of Variation	SS	df	MS	F	P-value	F crit
Between Groups	515	3	171.6666667	17.45762712	0.000113	3.490295
Within Groups	118	12	9.833333333
Total	633	15

here, ss(total)=633

ss(tret)=515

ss(error)=118