You carried out a study where you tested the effectiveness of a new therapy technique at reducing anxiety.You identified a group of high-anxiety individuals,and you measured their anxiety before therapy,immediately after therapy,and at two follow-up sessions 1 month and 2 months after the therapy is concluded.High scores on the anxiety measure are scaled to reflect relatively higher levels of anxiety.Here is the hypothetical data from SPSS output.

According to the main ANOVA analysis,how should the results be described (assume an alpha level of .05)?
A)The effect of the new therapy technique was statistically significant but its effect size was weak.
B)The effect of the new therapy technique was statistically significant and the effect size was strong.
C)The effect of the new therapy technique was not statistically significant,but the size of the effect suggests this may be due to low power.

Question

You carried out a study where you tested the effectiveness of a new therapy technique at reducing anxiety.You identified a group of high-anxiety individuals,and you measured their anxiety before therapy,immediately after therapy,and at two follow-up sessions 1 month and 2 months after the therapy is concluded.High scores on the anxiety measure are scaled to reflect relatively higher levels of anxiety.Here is the hypothetical data from SPSS output.  
 
According to the main ANOVA analysis,how should the results be described (assume an alpha level of .05)?
A)The effect of the new therapy technique was statistically significant but its effect size was weak. 
B)The effect of the new therapy technique was statistically significant and the effect size was strong. 
C)The effect of the new therapy technique was not statistically significant,but the size of the effect suggests this may be due to low power.

Quizplus · Accepted Answer

The p-value for the main ANOVA analysis is less than .05, indicating that the effect of the therapy technique on anxiety scores was statistically significant. Additionally, the effect size (partial eta squared = .29) is considered strong, suggesting that the therapy technique had a meaningful impact on reducing anxiety in the high-anxiety individuals.

You Carried Out a Study Where You Tested the Effectiveness