Research method Psych discussion homework

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Simple statistics that includes ANOVA, independent t-test, dependent t- test, also some questions regard to psychology research. It is kind of rigorous, so I need some help. Thanks

PSY 3211 – Research Methods and Design I – Discussion #13 – Three’s A Crowd Group Members: _______________________________________________________________ Instructions: FIU has a pretty good reputation for addressing the needs of traditional students (those who attend classes on campus), fully online students (who attend classes only online), and hybrid students (those who have both online and on campus course components). Let’s say we want to test the effectiveness of these different learning modalities when it comes to a class in psychology research methods. You design a study to assess methods knowledge at the end of the semester (scores can range from 0 to 100 on a 100 point scale). Using the data below for 10 students in each condition, calculate the F value and determine if it is significant. Make sure to complete the eight steps for research noted in your Salkind textbook. Finally, write up the findings as you would see it in an APA empirical journal article (if significant, you would normally need to run a post hoc test. However, you can just provide the means and eyeball them to see which, if any, learning modality leads to more learning). As you work on this problem, go through the each of the eight steps for research noted in your Salkind textbook again. This is a tough assignment, so I will give you the means and SDs for the first two (find the hybrid mean and SD on your own): Class Mean Standard Deviation Traditional Scores 96 94 93 95 86 80 84 77 86 92 88.30 6.65 Online Scores 93 78 91 67 85 99 88 82 92 84 85.90 9.00 Hybrid Scores 96 77 89 80 93 91 94 92 97 82 Use the last page Use the last page As you work on this problem, make sure to provide information for each of the eight steps we cover in Chapter 11 (Salkind) as well as the APA write-up you would see in a results section. 1. State the null and alternative hypotheses 2. Tell me your level of risk 3. Determine the best statistical test to use 4. Compute the test statistic. I’ll even give you the table to use (formulas on the last page)! Tradition 96 94 93 95 86 80 84 77 86 92 X2 Online 93 78 91 67 85 99 88 82 92 84 X2 Hybrid 96 77 89 80 93 91 94 92 97 82 n ΣX X Σ(X2) (ΣX)2/n X2 N ΣΣX (ΣΣX)2/N ΣΣ(X2) Σ(ΣX)2/n SS Between = SS Within = Total Sum of Squares = MS (between) = MS (within) = F = MS Between / MS Within = 5. Determine the value needed to reject the null hypothesis. Remember to calculate the correct degrees of freedom before finding the critical F-value! 6. Compare the obtained and critical value 7. Decide whether you will retain the null hypothesis or … 8. Decide whether you will reject the null hypothesis 9. Write up your results as you would see it in a results section of an empirical research paper. Make sure to include the means and SDs for all three conditions. If significant, note that a post hoc test would be needed to see which means differ, but you do not have to run actual post hoc tests for this discussion. 10. Was your obtained F value in #4 positive or negative? Would it matter either way? With your discussion group, tell my why a positive or negative value is not important when it comes to your obtained value. (Note: This question is a bit trickier to answer than the similar one I asked in Assignment #11. There, we discussed the t-Test and positive/negative values. The answer to this one in Assignment #13 is different, but you should still be able to answer it!) 11. We saw in Chapter 12 (Tea for Two Again) that we can run a dependent t-Test. Can we do the same (that is, use the same participants multiple times) with a three group design? If so, design a dependent study with three groups. Make sure to note your IV and DV. 12. Although we won’t cover post hoc tests in this course, we will in Methods II. I want to prepare you for them a bit right now. Look at figure 13.6 in your Salkind textbook(pp.258). With your group, tell me which of their three conditions differ (if any) in your textbook example and tell me how you know they differ. 13. When should you run post hoc tests? Why do you run them? Finally, why not just run three different t-Tests, one comparing groups 1 and 2, one comparing groups 1 and 3, and one comparing groups 2 and 3? Justify your responses. MSbetween = SSbetween dfbetween SSbetween =  MS within = ( x) 2 (   x) 2 − , dfbetween = k − 1 n N SS within df within SS within =  ( x 2 ) −  ( x) 2 , df within = N − k n Here’s a table you can use for the SD calculation! As promised, I did the first two groups. Traditional 96 94 93 95 86 80 84 77 86 92 M= n–1 (X – M)2 / n–1 SD (√ ) X–M 7.7 5.7 4.7 6.7 -2.3 -8.3 -4.3 -11.3 -2.3 3.7 (X – M)2 59.29 32.49 22.09 44.89 5.29 68.89 18.49 127.69 5.29 13.69 Online X – M 93 7.1 78 -7.9 91 5.1 67 -18.9 85 -.9 99 13.1 88 2.1 82 -3.9 92 6.1 84 -1.9 (X – M)2 Hybrid X – M (X – M)2 50.41 96 62.41 77 26.01 89 357.21 80 .81 93 171.61 91 4.41 94 15.21 92 37.21 97 3.61 82 88.30 9 398.1 / (10 – 1) = 44.23 85.90 9 728.9 / (10 – 1) = 80.99 6.65 9.00

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Anonymous
Wow this is really good.... didn't expect it. Sweet!!!!

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