(20 pts) Answer Problem 6 from Chapter 1 (the question is the same in older edit

Question

(20 pts) Answer Problem 6 from Chapter 1 (the question is the same in older editions of the book; see also below) You only need to do parts C&G. Be sure to specify each of the things asked for in the question, namely: (1) the independent variable, (2) the dependent variable, (3) the sample, (4) the population, (5), the data, and (6) the statistic. In addition to answering the questions in the book, please say what the results would look like if .In part C, only the medication treatment was effective. In part C, none of the treatments for depression were effective In part G, the new arrangement of keys had no impact on typing speed. In part G, the new arrangement of keys decreased typing speed. 2. Be as specific as you can about the pattern of results that would be consistent with these outcomes. Part C: A clinical psychologist is interested in evaluating three methods of treating depression: medication, cognitive restructuring, and exercise. A fourth treatment condition, a waiting-only treatment group, is included to provide a baseline control group. Sixty depressed students are recruited from the undergraduate student body at a large state university and fifteen are assigned to each treatment method. Treatments are administered for 6 months, after which each student is given a questionnaire designed to measure the degree of depression. The questionnaire is scaled from 0 to 100, with higher scores indicating a higher degree of depression. The mean depression values are then computed for the four treatments and compared to determine the relative effectiveness of each treatment. Part G: A typing teacher believes that a different arrangement of the typing keys will promote faster typing. Twenty secretarial trainees, selected from a large business school, participate in an experiment designed to test this belief. Ten of the trainees learn to type on the conventional keyboard. The other ten are trained using the new arrangement of keys. At the end of the training period, the typing speed in words per minute of each trainee is measured. The mean typing speeds are calculated for both groups and compared to determine whether the new arrangement has had an effect

Explanation / Answer

ANS::

Part C

Independent variable = Treatment method (4 categories)

Dependent variable = Depression level after treatment

Sample = 60 depressed undergraduate students from a large state university

Population = People suffering from depression

Data = Score on depression for each student in the sample

Statistic = Average score on depression for the sample of students for each treatment method

Part G

Independent variable = group based on type of keyboard (2 categories)

Dependent variable = Typing speed

Sample = 20 secretarial trainees from a large business school

Population = All typists

Data = Words typed per minute by each trainee in the sample

Statistic = Average of the words typed per minute by the sample of trainees for each group (based on keyboard type)

Results based on following conditions

Part C

If only the medication treatment was effective, the mean score on depression in the medical treatment group would be significantly lesser than the mean score on depression for other treatment groups, especially the control or the waiting only treatment group.

If none of the treatments for depression were effective, there would not be any significant difference in the mean score on depresson across the four treatment groups. The mean score for the three methods would be close to the mean score of the control or the waiting only treatment group.

Part G

If the new arrangement of keys had no impact on typing speed, the mean of words per minute by the group using the new keys would not be significantly different from the mean of words per minute by the group using conventonal keyboard

If the new arrangement of keys decreased typing speed, the mean of words per minute by the group using the new keys would be significantly lesser than the mean of words per minute by the group using conventonal keyboard

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