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SPSS Cumulative Assessment Instructions

The following research questions can be answered using 1 of the 5 tests you have learned so far: single-sample t-test, paired-samples t-test, independent-samples t-test, one-way ANOVA, or two-way ANOVA. Use the information in the tables to construct your SPSS data file, just as you have been doing in Part 2 of each homework assignment. There is only 1 correct choice of analysis for each question. The assessment is open-book/open-notes.

For each problem involving a test of significance, your answer must include: A) the output and an appropriate graph from SPSS; B) a statistical statement (i.e., t(19) = 1.79, p = .049); and C) a sentence summarizing the results (i.e., “There was a significant difference between the two groups on the variable…” or “There was no significant difference…”).

For ANOVA problems: Report statistical findings and make statements for all main effects and interaction effects. Use the Fisher LSD test for any analyses requiring post hoc tests.

Submit this assignment by 11:59 p.m. (ET) on Monday of Module/Week 5.

1. An entrepreneur claims that he has developed a program that can increase the IQ of adolescent students. To test this claim, a psychologist administers the WISC (an IQ score for children) to a group of students before and after completing the training program. Analyze the data to test the entrepreneur’s claim. (16 pts)

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 was implemented. 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 1 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 1 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 1 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? (16 pts)

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