PSYC 510 HOMEWORK 5 Correlation and Regression
Homework 5
Correlation and Regression
When submitting this file, be sure the filename includes your full name, course and section. Example: HW5_JohnDoe_510B01
Be sure you have reviewed this module/week’s lesson and presentations along with the practice data analysisbefore proceeding to the homework exercises. Complete all analyses in SPSS, then copy and paste your output and graphs into your homework document file. Answer any written questions (such as the text-based questions or the APA Participants section) in the appropriate place within the same file.
| Part I: General Concepts
These questions are based on the concepts covered in this week’s assigned readings and presentations. 2 points per question for Part I |
| A positive correlation (r = 0.60) is found between time spent outside at age four and creativity in kindergarten. Answer the following questions based on this result.
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| 1. | Describe what prediction can be made in regards to creativity in kindergarten for a child who spent a lot of time outside at age four. | Answer:
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| 2. | Calculate the coefficient of determination for this scenario. | Answer: |
| 3. | If a journalist made an error in causality when writing an article about these findings, what would they be concluding based on this scenario (one sentence is sufficient)?
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| 4. | If this researcher had a sample size of 13 and started with a directional hypothesis, what was the critical r value (using the table in your textbook)? | Answer: |
| 5. | Should she reject or fail to reject her null hypothesis? | Answer: |
| 6. | If the researcher concludes that there is a relationship between time spent outside and creativity but in fact, there is NOT, what type of decision did s/he make (Type I error / Type II error, or correct decision). | Answer: |
| Scenario: A high school teacher believes that students who play musical instruments have better writing skills than students who do not play musical instruments. | |
| 7. | If she wanted to test this belief (that students who play musical instruments have better writing skills than those who do not play musical instruments), what is the null hypothesis? |
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| 8. | What is the alternative hypothesis in this scenario? |
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| 9. | What is the symbolic notation for this alternative hypothesis? |
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| 10. | Is this one or two tailed? |
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| Which type of correlation analysis would you run based on the given variables? | ||
| 11. | Relationship between key terms (coded as being “controversial” or “non-contraversial”) and number of daily visits to your website
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| 12. | Relationship between high school GPA and college GPA
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| 13. | Relationship between religiousity (yes / no) and whether someone has a current diagnosis of mental illness (Yes / No). | Answer: |
| Answer the following questions using key terms from your assigned readings and presentations. | ||
| 14. | What is the standard alpha level used in the social sciences (and in this class)? | Answer: |
| 15. | Which probability rule would be used to determine the probability of getting into both your first choice graduate program AND getting an interview at your first choice post-graduation? | Answer: |
| 16. | Solve for the probability of BOTH events occuring if the probability of getting into your first choice graduate program is estimated to be 25% and getting an interview at your first choice job post-graduation is estimated to be 50%. | Answer: |
| 17. | If the robt = 0.20 and the df = 70 and the test was two-tailed, what is the rcv?
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| 18. | Given the values provided in #17, should you reject or fail to reject the null hypothesis?
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| Part II: SPSS Application
These questions require the use of SPSS. Remember you must submit all of your work within this word document. You will need to take a screen shot of your data view if necessary, or copy and paste your output into the spaces below. Remember to report the exact p value provided by SPSS output – simply reporting p<.05 or p>.05 is not acceptable (unless SPSS output states p=.000 – in that case you can report p<.001).
A researcher wants to study a current theory that those who are more susceptible to hypnosis are more prone to experience changes to their sense of agency (being in control of one’s actions and their outcomes). She also collects data on their personal belief in hypnosis. She recruits a sample of 23 participants and administers the Stanford Hypnotic Susceptibility Scale:C (SHSS:C, Weitzenhoffer and Hilgard, 1962) and the Sense of Agency Rating Scale (SOARS, Polito et al., 2013). On the SHSS:C, higher scores indicate being more susceptible to hypnotism (a person is easier to hypnotize). On the SOARS measure, higher scores indicate changes to a person’s sense of agency, or control. To evaluate their personal belief in hyponosis, a Likert-based score was calculated from several questions, with a lower number indicating disbelief in hypnosis and a higher number indicating stronger belief in hypnosis (BELIEF). This data set is located in the Reading & Study section for Week 5 and is titled “Module 5 Data Set 1”.
Points differ by question. Total section = 16 pts |
| 19. | Conduct a Pearson correlation coefficient analysis to determine whetherthere is a relationship between sense of agency and belief in hypnosis. Paste the relevantSPSS output below. (3 pts) |
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| 20. | Write the results in APA style. Make sure to indicate whether it is one or two-tailed and if appropriate, the coefficient of determination. (4 pts) |
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| 21. | Conduct a linear regression to see if you can predict susceptibility to hyponosis (SHSS) based on sense of agency (SOARS). Paste the relevantSPSS output below. (3 pts) |
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| 22. | Write the results in APA style. (3 pts) |
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| 23. | Create an appropriate graph for this data if using a regression equation (3 pts) |
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| Part III: Cumulative
These questions can be related to anything covered thus far in the course. 2 pts per question |
| 24. | If the mean is 7.0, the median is 6.5, and the mode is 5.5, how would you describe this distribution in terms of skew (positive, negative, or no skew)?
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| 25. | Imagine a class where nearly everyone scores between 83-84%, with hardly any dispersion beyond this narrow peak. How would you describe this distribution in terms of kurtosis?
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| 26. | Identify the specific type of validity addressed in this statement:
Mischel’s marshmallow test in young children accurately predicts emotional intelligence later in life.
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| 27. | If you want to read about the limitations of the current study and ideas on future studies in an empirical article, what section should you focus on reading (beyond the abstract – think Introduction, Methods, Results, or Discussion)?
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Submit Homework 5 by 11:59 p.m. (ET) on Sunday of Module/Week 5. Remember to name file appropriately.
| Done! |
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