Spring 2017 PSYC 0308

Part 1

Instructions for Part 1:Complete all problems, and SHOW ALL WORK (on a separate sheet)! Be sure that when you explain the results (in APA format), your explanation is meaningful and clear (proofread!).

1. A psychologist would like to measure the effectiveness of a new treatment for Generalized Anxiety Disorder.To do so, she first measures the level of anxiety experienced by her patients before they receive any treatment.She uses a self-report measure called the State-Trait Anxiety Inventory (STAI).Higher scores indicate more anxiety.She then provides the new treatment, which takes 12 sessions.After the 12 sessions are completed, she again has her patients complete the STAI to measure their anxiety symptoms.The data are as follows:

Patient Pre-treatment STAI score Post-treatment STAI score

A 45 28

B 38 33

C 27 28

D 42 31

E 29 28

F 35 22

G 31 19

H 32 31

a. What kind of a research design is the psychologist using? (circle one)

i. Independent measures (between subjects)

ii. Repeated measures (within subjects)

b. What is the dependent variable in this study? (be specific)

c. Using the appropriate statistical procedure, conduct a hypothesis test to determine whether the treatment was effective. Use a two-tailed test, = .05.BE SURE TO INCLUDE ALL 4 STEPS OF THE HYPOTHESIS-TESTING PROCEDURE!Dont forget to calculate the effect size if necessary.

d. Summarize in words (in APA format) what the results indicate (Be sure you have both reported your results in APA format and explained what they mean).

2. The following data set shows final grades (out of 100) for 10 individuals who have completed both the Research Methods course (X) and the Statistics course (Y):

X Y

71 65

80 70

72 75

87 85

89 82

93 87

95 97

90 91

69 77

59 60

a. Use the data set to find the linear regression equation for predicting Y (grade in Statistics) from X (grade in Research Methods).

b. For a student who earns a grade of 85 in Research Methods, what would you predict his/her grade to be in Statistics?

3. A researcher would like to know whether there is a consistent, predictable relationship between verbal skills and math skills for high school students.A sample of 200 students is obtained and each student is given a standardized English test and a standardized math test.Based on the test results, students are classified as high or low for verbal skills and for math skills.The results are summarized in the following frequency distribution:

Verbal Skills

High Low

Math Skills High 50 30

Low 50 70

a. What kind of statistical test should the researcher use to analyze her data? (be specific)

b. Based on these results, can the researcher conclude that there is a significant relationship between verbal skills and math skills?Include all 4 steps of hypothesis testing.Use = .05.Dont forget to calculate the effect size if necessary.

c. Summarize in words (in APA format) what the results indicate (be sure you have also explained what the results mean):

Part 2

Instructions for Part 2:

a) Choose the most appropriate statistical technique.

b) Use SPSS to analyze the data.You must provide the data output from SPSS. You can save the file and message it to me, or you can take a screenshot and message it to me.

c) Write out a summary of your findings as you might in an empirical research report (using APA format).Remember to report means and standard deviation if appropriate, either in text or in a table.Be sure your summary is meaningful and clear!

1. A psychologist is interested in comparing a group of females to a group of males with respect to body image.Specifically, she would like to determine whether females have more negative body images than males.She obtains a sample of 10 college women and 10 college men.All participants complete a self-report measure of body image (scores range from 1-100, with higher scores indicating a more positive body image).Results are as follows:

Females Males

75 70

60 65

55 80

85 95

25 85

40 75

45 75

65 70

30 55

80 60

a. Which statistical technique should be used?

b. Either provide a picture or a screenshot of your SPSS data output.

c. Report your results (using APA format, as described in the instructions for Part 2 of this exam) and explain what they mean.

2. A psychologist specializing in anxiety disorders is interested in determining whether the type of music played in the waiting room has an effect on patients reported levels of anxiety at the start of the therapy session. Each day for three days the psychologist plays a different type of music (classical, rock, hip-hop) in the waiting room and then asks the patients to rate their level of anxiety on a subjective rating scale ranging from 0-100 as soon as they enter the therapy room.The psychologist sees 8 patients per day, and each day the patients are different.

Classical Rock Hip-hop

50 40 65

55 60 75

30 70 45

60 65 55

45 75 50

40 55 50

40 60 70

35 65 65

a. Which statistical technique should be used?

b. Either provide a picture or a screenshot of your SPSS data output.

c. Report your results (using APA format, as described in the instructions for Part 2 of this exam) and explain what they mean.