A psychiatrist is interested in a new form of drug treatment (melatonin) for depression. She compares the effect o melatonin treatment with a control group and two other types of therapy: lithium treatment and psychotherapy. The following are subjects' data, after their respective treatments, on a behavioural measure of depression: large scores indicating more depression. Control Psychotherapy. Lithium 12 10 ni x-bar; 16.8 5.2 17.2 6.5 14 11.6 4.0 Melatonin 12 10.3 3.8 Si Do the different treatments result in significantly different measured amounts of depression (a <.05)?

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Answer both questions Answer to question 1: F = 6.15, Reject H0: the different treatments do result in significantly different levels of depression Answer to question 2: F = 19.07, Reject H0: the different dosages result in significantly different levels of depression
2. After the first study, the psychiatrist randomly assigned 15 manic-depressive subjects to one of 3 groups, which were
administered either 0, 5, or 10 ml. of melatonin. After treatment, the subjects' scores on the depression measure
were:
25728
23
16
9
13
12
20
15
11
Do the different dosages of melatonin result in significantly different measured amounts of depression? (a ≤.01)
17
Control Group
(0 ml.)
21
Treatment 1 Treatment 2
(5 ml.)
(10 ml.)
14
7821
Transcribed Image Text:2. After the first study, the psychiatrist randomly assigned 15 manic-depressive subjects to one of 3 groups, which were administered either 0, 5, or 10 ml. of melatonin. After treatment, the subjects' scores on the depression measure were: 25728 23 16 9 13 12 20 15 11 Do the different dosages of melatonin result in significantly different measured amounts of depression? (a ≤.01) 17 Control Group (0 ml.) 21 Treatment 1 Treatment 2 (5 ml.) (10 ml.) 14 7821
1. A psychiatrist is interested in a new form of drug treatment (melatonin) for depression. She compares the effect of
melatonin treatment with a control group and two other types of therapy: lithium treatment and psychotherapy.
The following are subjects' data, after their respective treatments, on a behavioural measure of depression: larger
scores indicating more depression.
Control Psychotherapy. Lithium
12
10
14
ni
x-bar; 16.8
5.2
17.2
6.5
11.6
4.0
Melatonin
12
10.3
3.8
Si
Do the different treatments result in significantly different measured amounts of depression (a ≤.05)?
Transcribed Image Text:1. A psychiatrist is interested in a new form of drug treatment (melatonin) for depression. She compares the effect of melatonin treatment with a control group and two other types of therapy: lithium treatment and psychotherapy. The following are subjects' data, after their respective treatments, on a behavioural measure of depression: larger scores indicating more depression. Control Psychotherapy. Lithium 12 10 14 ni x-bar; 16.8 5.2 17.2 6.5 11.6 4.0 Melatonin 12 10.3 3.8 Si Do the different treatments result in significantly different measured amounts of depression (a ≤.05)?
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