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| Student | IQ before | IQ after |
| 1
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 |
103
85 94 106 74 98 83 93 103 96 109 115 86 122 112 126 118 72 |
99
89 90 108 74 99 80 99 107 93 111 117 83 122 120 131 116 74 |
2. The staff at a local psychiatric facility wants to determine whether implementing a no-smoking rule significantly decreases the length of stay of inpatients. In order to test this claim, they compared the length of stay of patients admitted before a No Smoking rule was implemented to another group of patients admitted after the No Smoking rule. Evaluate the claim that the average length of stay was significantly shorter for the group admitted after the facility implemented the rule. (16 pts)
| Smoking Allowed | No Smoking | ||
| 8
5 2 5 8 6 4 14 |
7
15 12 8 4 13 10 8 |
5
10 7 8 2 3 2 4 |
4
8 4 5 2 4 6 7 |
3. Depressed patients are randomly assigned to one of 3 therapists. At the end of 3 months, each patient completes a standardized test of depression (higher scores indicate higher level of depression). The patients’ scores are shown below. Analyze the data to determine how effective these 3 therapists are at treating depression (assume that before the treatment, all 3 groups of patients had the same average depression score). (16 pts)
| Therapist 1 | Therapist 2 | Therapist 3 |
|
35 37 35 37 36 33 39 |
36 37 37 31 39 35 32 |
29 32 25 28 33 30 32 |
4. In light of all the weight loss misinformation and fad diets, a medical researcher determines to evaluate several of them. She randomly assigns volunteers (identified as clinically obese) to one of 4 diets. She is a firm believer in the benefits of exercise so she also assigns them to either the exercise or no exercise group. After 3 months, she compares the pounds lost for each condition. Was there a significant effect of the diets and exercise on weight loss? (16 pts)
|
Exercise |
Low Carb | South Beach | Adkins | Weight
Watchers |
|
26 28 30 25 20 |
28 22 18
|
25 21 24 29
|
28 28 30 25 26 |
|
|
No Exercise |
15 20 18
|
18 12 15 15 |
17 19 28 25 21
|
34 25 30 28 |
5. Infants exposed to cocaine in their mother’s womb are thought to be at high risk for major birth defects. Thirteen infants born to mothers who are addicted to cocaine are administered the Brazelton Neonatal Assessment one day after birth. For these babies, their scores were as follows
| Brazelton Scores |
|
6.25 4.50 8.50 5.50 3.00 7.90 7.50 5.30 6.80 7.50 5.25 7.45 6.80 |
For the general population, babies normally score an 8.5. Is this group of babies significantly lower than normal?
