Lab 7 Worksheet Indep & Related t 2

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Name:___ Tasnia Ahmed ______________ Lab #7: Independent- & Paired-Samples t -Tests PSYCH 248 PLEASE TYPE ALL ANSWERS IN BLUE . ROUND ALL ANSWERS TO TWO DECIMAL PLACES (i.e., 0.05). Part A Compare 2 groups: Do pet owners differ from those with no pets in the number of annual therapy visits? Test it using the data below on the number of visits to a therapist over a year. Copy or enter the data into excel, save the file as csv and open it in JASP. Pet owners : 1, 3, 4, 5, 2, 4, 6, 8, 3, 4, 1, 2, 9, 1, 4, 2 No pets : 2, 4, 5, 6, 1, 7, 8, 9, 14, 5, 3, 2, 4, 8 1. Is this a between-subjects or within-subjects design? Between-subjects design 2. What is the independent variable? Whether parbcipants have pets or not 3. What is the dependent variable? Number of therapy visits over a year 4. Is the hypothesis one-tailed or two-tailed? Two-tailed 5. State the null hypothesis in words. There is no significant difference in the number of visits made between those who have pets and those who do not have pets. 6. State the null hypothesis in symbols. H 0 : μ d = 0 7. State the alterna7ve hypothesis in words. There is a significant difference in the number of visits made between those who have pets and those who do not have pets. 8. State the alterna7ve hypothesis in symbols. H A : μ d ≠ 0 In JASP, click T-Tests > Classical > Independent Samples T-Test . Transfer Visits to the Variables box and Owner to the Grouping Variable box. Run Student t, specifying your Alt Hyp. Under Assumpbons check Normality ,3 Equality of Variances (Levene) , Addibonal Stats: Loca>on Parameter ( Confidence interval 95%) , Effect Size ( Cohen’s d) , Descrip>ves , and Descrip>ves Plots . 9. According to the Shapiro-Wilk test of normality and Levene’s test of equality of variances, is it appropriate to use Student’s t -test to analyze these data? How do you know? It is appropriate as the result shows p is greater than 0.05. 10. What is the sample size (n)? 30 11. What is the mean number of visits for pet owners? 3.688 12. What is the mean number of visits for non-owners? 5.571 13. What is the standard devia7on for pet owners? ___ 2.387 ___________ 14. What is the standard devia7on for non-owners? ___ 3.458 ___________ 15. Descrip>ves plots creates a graph with the mean and 95% confidence interval for the mean for each group. What is the approximate percentage of overlap between the two intervals? 50% 16. What is the value of t ? -1.755 17. What are the degrees of freedom? 28 18. What is the significance value? 0.090 19. What is the 95% confidence interval? -4.083 - 0.315 20. What is the value of Cohen’s d ? -0.642 1
21. Report the results of this test in APA format. We fail to reject the null hypothesis as there is no significant difference in the number of visits made between those who have pets (M = 3.688, SD = 2.387) and those who do not have pets (M = 5.571, SD = 3.458), with t(28) = -1.755, p = 0.09. 2
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