PSYC 355 SPSS CUMULATIVE ASSESSMENT

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)