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

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:

 

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

 

1. a) R
2. b) R^2
3. c) r
4. d) r^2
5. e) p
6. f) X^2
7. g) d
8. h) F
9. 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?

 

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?

 

 

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

What is the best test?

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

 

 

 

 

 

 

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

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

True

False

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

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9) A large effect size might represent an unimportant result

True or False

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10) To determine whether AIDerall enhances studying, you give the drug to a group of 14 students and engage another 14 students as a control group. Both groups then solve 40 mathematical problems. The lowest score students can receive is zero; the highest is 40. Students who took AIDerall received these scores: 32, 25, 17, 12, 17, 22, 27, 30, 27, 21, 19, 25, 23, 28. Students in the control group received these scores: 33, 21, 14, 20, 36, 11, 32, 12, 15, 18, 19, 22, 14, 13

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For the AIDerall group and rounding every answer to the nearest integer, what are the:

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Mean: [“5”, “8”, “14”, “19”, “20”, “23”, “24”, “25”]

Median: [“5”, “8”, “14”, “19”, “20”, “23”, “24”, “25”, “17”]

Standard Deviation: [“5”, “8”, “14”, “19”, “20”, “23”, “24”, “25”]

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For the control group and rounding every answer to the nearest integer, what are the:

Mean: [“5”, “8”, “14”, “19”, “20”, “23”, “24”, “25”]

Median: [“5”, “8”, “14”, “19”, “20”, “23”, “24”, “25”]

Standard Deviation: [“5”, “8”, “14”, “19”, “20”, “23”, “24”, “25”]

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What is the&nbsp;d&nbsp;(using for your computations the rounded integers you previously derived):

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[ Select ]

[“.2”, “.25”, “.275”, “.3”, “.35”, “.40”, “.425”, “.461”, “.48”, “”]

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How would you analyze the data from this study?

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[ Select ]

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[“t-test”, “ANOVA”, “Chi-square”, “Pearson”]

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11) ANOVA yields what statistic?

12) A small, significant difference is not an important finding.

13) Which of the following yield(s) a p value?

(select all possible answers)

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14) Insignificant differences are not useful. True or false?

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

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16) All following questions are about Table 1.

Table 1. Outcomes of Cognitive-Behavior Therapy (CBT), Motivational Interviewing (MI), or No Therapy (Control)

Notes. aBeck Depression Inventory (0 – 35); lower scores indicate less depression. bMarquart Anxiety Scale (0 – 100); lower scores indicate less anxiety. cDays of using mood management drugs during CBT or MI (0 – 60). IDays on which one or more alcohol drinks were consumed in last month (0 – 30). Dissimilar subscripts indicate that means differ p < .05.

*p < .10; **p < .05; ***p < .01.

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Did age significantly differ by treatment group?

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17) What test was used for comparing these variables?

Age

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18)Female

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19) Depression

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20) Anxiety

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21) Medication

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22) Alcohol use

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23) If you had to decide which treatment worked best, what would be the basis for your conclusion? Mark all that apply.