Deck 30: Effect Size

Question 1

For an experimental group, M=50 and SD=7. For control group, M=46 and SD=8. For this experiment, what is the value of d?

Answer 1

0.5
Calculation: (50-46)/ 8= 0.5

Question 2

Is the effect size for question above "very large"?

Answer 2

NO, MEDIUM

Question 3

If we read a report that states that d equals 1.00, what does this mean?

A) The experimental group has a mean that is a full standard deviation higher than the mean of the control group
B) The experimental group has a mean that is a full point higher than the mean of the control group
C) This is considered low effect size

Answer 3

A

Question 4

There are only about four standard deviation units above (and below) the mean.

Question 5

What does a Cohen's d value of 0.80 NOT indicate?

A) Eight-tenths of a standard deviation
B) Small effect size
C) Large effect size

Question 6

Which of the following is NOT a principles of effect size?

A) A small effect size might represent an important result
B) A large effect size might represent an unimportant result
C) A small effect size does not represent important results
D) A large effect size might represent an important result

Question 7

Which of the following steps are NOT part of interpreting the difference?

A) Determine whether the difference is statistically significant at an acceptable probability level
B) For a statistically significant difference, consider the value of d
C) For a statistically insignificant difference, still consider the value of d
D) Consider the implications of the difference for validating any relevant theories as well as the practical significance of the results

Question 8

In what situation(s) would the value of the d be meaningless?

A) Inadequate sampling
B) Invalid instrumentation
C) Poor research design
D) All of the above
E) A and B only