PSYCHOLOGY STATISTICS

SPSS Cumulative Assessment Instructions (80 points)

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, and note that some tests are 1-tailed and some are 2-tailed. The assessment is open-book/open-notes.

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

For ANOVA problems: Report statistical findings and make statements for all main effects and interaction effects. Use Tukey’s test for any analyses requiring post hoc tests. Do not create a boxplot for the 2-way ANOVA--use the graph we typically use in the course for this type of test.

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

· A group of clinical psychologists conducts a randomized clinical trial examining psychosocial and pharmaceutical treatments, alone or in combination, for Social Anxiety Disorder (SAD). Participants who have been diagnosed with SAD are randomly assigned to one of three treatment groups: cognitive behavioral therapy (CBT); Paxil ® (a common SSRI prescribed to patients with SAD); and CBT + Paxil ®. The participants are assessed after 6 months of treatment using the Social Avoidance and Distress Scale (SADS; Watson and Friend, 1969), where higher scores indicate higher levels of social anxiety. Is there a difference in the effects of these three treatments on social anxiety outcomes? (16 pts)

CBT	Paxil ®	CBT + Paxil ®
16 18 13 20 21 16 19 19	17 25 14 14 18 23 18 20	12 12 14 25 18 15 20 13

· SPSS output (5 pts)

· SPSS graph (5 pts)

· APA-style Results section (6 pts)

·

· A school psychologist has gathered data from teachers and parents and identified a sample of 14 twelve-year-old boys who are at risk for developing serious externalizing behavior disorders (such as Conduct Disorder). She wants to know if this sample scores higher than the population mean on a measure of behavior where higher scores indicate higher levels of externalizing behavior. The population mean on this measure is 36. Conduct the appropriate analysis to analyze the research question. (16 pts)

Scores on Measure of Externalizing Behavior

29 35 26 40 47 47 39 21 33 36 34 41 44 29

· SPSS output (5 pts)

· SPSS graph (5 pts)

· APA-style Results section (6 pts)

· After identifying the at-risk boys in the previous question, the school psychologist implements a treatment program focused on reducing antisocial, impulsive, oppositional, and other externalizing behaviors for this sample of boys. She assesses the boys after treatment using the same measure that she used before treatment (where higher scores indicate higher levels of externalizing behaviors). Did the treatment program significantly reduce levels of externalizing behaviors? (16 pts)

·

Student	Externalizing behaviors before treatment	Externalizing behaviors after treatment
1 2 3 4 5 6 7 8 9 10 11 12 13 14	29 35 26 40 47 47 39 21 33 36 34 41 44 29	29 34 21 35 41 46 38 25 32 30 28 40 36 26

· SPSS output (5 pts)

· SPSS graph (5 pts)

· APA-style Results section (6 pts)

· A community psychologist working in a low-income, high-risk area wants to implement a conflict-resolution program in his community. In working towards this goal, he decides to examine the effects of different types of prevention programs for building effective communication skills for 8th grade students in his local school. He develops two types of programs, one based on a traditional lecture and reading format, and one based on interactive role-play during sessions. He also wants to know whether it is more effective to deliver this type of program during class hours or in an after-school program. Students in one 8th grade class are randomly assigned to one of the four conditions. After 6 months of the program, they are assessed on a measure of effective communication skills where higher scores indicate more effective communication skills. The data appear in the table below. Evaluate whether there is a difference in communication skills outcomes among the groups. (16 pts)

·

In-Class	Lecture	Role-play
	3 4 11 5 10	11 14 13 6 12
After-school	11 6 9 10 9	13 10 12 11 9

· SPSS output (5 pts)

· SPSS graph (5 pts)

· APA-style Results section (6 pts)

· A counselor is interested in evaluating the attitudes that different groups attach to seeking mental health treatment. Specifically, she wants to evaluate the theory that help-seeking behavior differs between those who have a perception of an internal locus of control versus an external locus of control. She administers a measure called the Attitudes Toward Seeking Professional Psychological Help-Short Form (ATSPPH-SF; Fischer and Farina, 1995) to a sample of 30 participants, who have been screened and assigned to groups based on their prevalent personal theory of locus of control. On the ATSPPH-SF, higher scores indicate more positive attitudes towards seeking mental health treatment. The results are in the table below. Analyze the data to determine whether there is a difference in treatment-seeking attitudes between these two groups. (16 pts)

Internal Locus of Control (n =16)	External Locus Of Control (n =14)
25 23 17 19 18 26 19 21	28 23 23 22 16 20 17 17	20 23 16 12 14 14 21 19	14 10 22 17 19 21

· SPSS output (5 pts)

· SPSS graph (5 pts)

· APA-style Results section (6 pts)