Statistics discussion

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SPSS Cumulative Assignment Instructions

The following research questions can be answered using one of the five 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 Two” of each homework assignment. There is only one correct choice of analysis for each question. The assessment is open-book and note.

For each problem involving a test of significance, your answer should 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….”  etc.). 

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.

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.  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? (16 pts.)


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