Effect Sizes Practice Quiz

Which of the following statements are TRUE of the effect size?

• quantifies the practical significance of a finding

• reflects the odds that a particular finding could have occurred by chance

• reflects the magnitude, or size, of the difference

• number measuring the strength of the relationship between two variables

The effect size is more important than statistical significance in clinical and commercial contexts.

• TRUE

• FALSE

• Both are equally important

What are the three classes of effect sizes?

• Standardized Difference ES, Variance Accounted for ES, Corrected ES

• Cohen's d, Glass' delta, Omega ^2

• alpha, beta, power

• eta ^2, partial eta ², omega ² , p-value

In solving for Cohen's d, solving towards the direction of improvement yields a ____result.

A computed Cohen's d value of .79 means that the effect size is _____

• small

• medium

• large

• negligible

Which of the following are known formulas for η²?

• SS_Treatment/(SS_Treatment + SS_Error)

• SS_effect / SS_total

• SS_between / SS_total

• SS_total / SS_error + SS_between

A computed (eta) η² value of .06 and below is ___.

• small

• medium

• large

The_______is an effect size used in the analysis of variance that is a more conservative estimate of effect size.

• ω²

• η²

• η² _p

• Glass Δ

What are needed to conduct a power analysis?

• alpha

• beta

• sample size

• effect size

Which of the following formula would be used to compute for sd pooled for Cohen's d if the number of samples for each group is different?

• √(s1²+ s2²)/2

• s1² + s2²/2

• √[s1² (n1-1)+ s2² (n2-1)]/ (n1+n2-2)