SPSS
Diamond768
HomeworkReviewSPSSAssignmentInstructions2.docxPSYC 515
Homework: Review SPSS Worksheet Instructions
Overview
This worksheet is designed to assess your ability to perform, interpret, report, and graphically represent the following statistical tests using SPSS and standard reporting conventions as covered in this course: correlations, regression, independent samples t tests, and correlated groups t tests. These are standard tests in our field and are foundational to the more sophisticated research designs. Knowledge of these tests provide fundamental skills to critically evaluating and producing research in one’s field.
Instructions
Be sure you have reviewed this module’s assigned readings and presentations before completing this assignment. This includes using ensuring the homework is completed and submitted according to the instructions, SPSS output and images are legible and relevant, and that basic college level writing skills (e.g., grammar) are used in the write-ups. Answers should be placed where indicated (e.g., “ANSWER”). Note: all questions must be attempted to be eligible for full credit. Please note that for all problems in this course, the standard cut-off (alpha) for a test of significance will be .05, and you always report the exact power unless SPSS output states p=.000 (you’d report p<.001). Also, remember that we divide the p-value in half when reporting one-tailed tests with 1 – 2 groups. Also – remember to check your graphs! You often have to ADD the y – axis title.
· Submit the file as a WORD document (.doc or .docx). Make sure the filename of your submission includes your full name, course and section.
· Example: SPSS1_JohnDoe_515B01
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Scenario 1 |
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A major university would like to improve its tarnished image following a large on-campus scandal. Its marketing department develops a short television commercial and tests it on a sample of n = 10, the first ten students who entered a housing commons area who agreed to participate. Attitudes about the university are measured with a short questionnaire, both before and after viewing the commercial. Attitudes were on a scale of 0 – 20, which higher numbers reflecting better attitudes. Use the provided data to examine whether the commercial improved the university’s image. The data are as follows:
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1. In this specific scenario, what is the independent variable? Is it between or within subjects? How many levels does it have, and what are they? |
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ANSWER
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2. In this specific scenario, what is the dependent variable? What is its scale of measurement (nominal, ordinal, or scale)? |
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ANSWER
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3. Paste all relevant statistical output in the space provided below: |
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ANSWER
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4. Create an appropriate graph in SPSS and paste it in the space provided below: |
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ANSWER
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5. Present the results using APA format. This includes a full write-up to include a complete statistical notation as shown in the weekly presentations. The write-up also needs interpretation. If significant, state how. If it is not significant, what does that mean in layman’s terms? Additional examples of APA results sections are also available in the “Helpful Hints” document. |
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ANSWER
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6. Do you think this experiment has more internal validity or external validity? Explain your answer. (You may want to review chapters 9-10 in your Jackson e-book).
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ANSWER
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Scenario 2 |
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To measure whether test performance can be predicted based on one’s anxiety, a researcher asked his students to come to the lab 15 minutes before they were to take an exam in his class. The researcher measured the students' heart rates and then matched these scores with their exam performance after they had taken the exam. Use the data below and SPSS to test whether heart rate can predict test performance in the population.
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7. In this specific scenario, what are the two variables of interest? Which is the IV and which is the DV? What is the scale of measurement for each variable? |
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ANSWER
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8. Relate to this specific scenario: What is the null hypothesis? What is the alternate / research hypothesis? Which one do you statistically assess? |
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ANSWER
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9. Paste all relevant statistical output in the space provided below: |
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ANSWER
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10. Create an appropriate graph in SPSS and paste it in the space provided below: |
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ANSWER
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11. Present the results using APA format. This includes a full write-up to include a complete statistical notation as shown in the weekly presentations. The write-up also needs interpretation. If significant, state how. If it is not significant, what does that mean in layman’s terms? Additional examples of APA results sections are also available in the “Helpful Hints” document. |
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ANSWER
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12. What is a potential confound of this study? Provide a sufficient justification.
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ANSWER
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Scenario 3 |
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A psychology instructor at a large university teaches statistics. There are 22 students in the class, and he has broken them into two groups. Each group has a different graduate assistant who is responsible for running separate breakout lecture and lab sections of the course. One graduate assistant (GA) has lots of experience teaching, while the other has more limited experience. The instructor wants to check for comparable learning across the two GAs, hoping students receive similar experiences (i.e., to find no difference). The data below are the scores (out of 100) of the students on the first midterm. Use it to test whether there is a difference between the groups.
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13. In this specific scenario, what is the independent variable? Is it between or within subjects? How many levels does it have, and what are they? |
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ANSWER
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14. In this specific scenario, what is the dependent variable? What is its scale of measurement? |
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ANSWER
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15. Paste all relevant statistical output in the space provided below: |
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ANSWER
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16. Create an appropriate graph in SPSS and paste it in the space provided below: |
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ANSWER
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17. Present the results using APA format. This includes a full write-up to include a complete statistical notation as shown in the weekly presentations. The write-up also needs interpretation. If significant, state how. If it is not significant, what does that mean in layman’s terms? Additional examples of APA results sections are also available in the “Helpful Hints” document. |
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ANSWER
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18. Using information from this scenario, determine the degrees of freedom and whether this is a one- or two-tailed test. Use the Appendix in your e-book to find the critical value. Do not round – provide the exact critical value below. Label it “critical value”. Also provide the “obtained value” from your SPSS (and label it as such). Compare the critical and obtained values – does the critical value exceed the obtained value? What does this mean in regards to the null hypothesis (would you reject or fail to reject the null hypothesis)? |
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ANSWER
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Note: This assignment will be checked for originality using the Turnitin plagiarism tool.
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