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What unit of measurement does Cohen’s d use to express the difference between a control group mean and an experimental mean?

What unit of measurement does Cohen’s d use to express the difference between a control group mean and an experimental mean?

1) You want to compare improvement in depression scores on the PHQ-9 Quick Depression Assessment (on a scale of 0-27 where 0 represents no depression and 27 represents severe depression) between one group of 35 teenagers who participate in a singing class and a second group of 38 teenagers who participate in a boxing class. Mean improvement in depression scores over a 2-month period are:

Change in depression score Standard deviation
Singing Class -5.72 1.43
Boxing Class -8.46 2.19

What statistic will show you how much the boxing class reduced the teenagers’ depression scores?

a) R
b) R^2
c) r
d) r^2
e) p
f) X^2
g) d
h) F
i) t

2) Individuals experiencing depression were divided into three groups. Each group was counseled for different amounts of time (1 month, 6 months, or 12 months) to see how they scored on measures of psychological wellbeing.

What is the best test to find differences among the groups?

t-test of independent means
t-test of dependent means
ANOVA
Chi-square
Pearson r

3) You want to learn whether women named Sarah are more likely to have grown up in the Midwest and whether women named Sara are more likely to have grown up in the East.

What is the best test?

t-test of independent means
t-test of dependent means
ANOVA
Chi-square
Pearson r

4) You need to find whether different levels of happiness are associated with different levels of income.

What is the best test?

t-test of independent means
t-test of dependent means
ANOVA
Chi-square
Pearson r

5) Which of these values in an ANOVA table is of greatest interest?

Mean squares.
The value of p.
The value of F.

6) If you read, F = 3.50, df = 2, 20, p < .05, what conclusion do you draw?

a) The means tested differed.
b) More than two groups or multiple measurement points were employed in the study.
c) The relationship tested is statistically significant.
d) All of the above.
e) None of the above.

7) Equating a significant difference with a large difference is a mistake.

True

False

8) In an experiment with a treatment and control group, what does d = 2 mean?

a) The average participant in the experimental group did two standard deviations better on some measure than the average participant in the control group.
b) The average participant in the experimental group did two standard deviations worse on some measure than the average participant in the control group.


 

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