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PSYC 355 Independent Samples and Paired Samples T-Tests Analysis in SPSS

An SPSS-based analysis comparing independent and paired samples using T-tests.

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    PSYC 355 Page 1 of 7 PSYC 355 Independent Samples and Paired Samples T - Tests Analysis in SPSS SPSS H OMEWORK 2 I NSTRUCTIONS I NDEPEN DENT S AMPLES T - T ESTS Part 1 : Green & Salkind : Lesson 24 , Exercises 1 – 5 The following helpful tips are numbered to correspond with the exercise number to which they refer: 1. Type these values out underneath your copied and pasted output. (3 pts ) Group Statistics Weight classification N Mean Std. Deviation Std. Error Mean Time spent eating Big Mac specials in seconds overweight 10 589.00 42.615 13.476 normal weight 30 698.40 82.949 15.144 Independent Samples Test Levene's Test for Equality of Variances t - test for Equality of Means F Sig. t df Sig. (2 - tailed) Mean Difference Std. Error Difference 95% Confidence Interval of the Difference Lower Upper Time spent eating Big Mac specials in seconds Equal variances assumed 2.745 .106 - 3.975 38 .000 - 109.400 27.522 - 165.116 - 53.684 Equal variances not assumed - 5.397 30.828 .000 - 109.400 20.272 - 150.754 - 68.046 T - value for equal variances assumed: - 3.95 T - value for equal variances not assumed: - 5.397 2. Instead of identifying these values on your output, as the text states, write them in your Word file as written answers for #2 a, b, and c. (3 pts , 1 point for each letter)

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    PSYC 355 Page 2 of 7 a. The mean eating time for overweight individuals was 589 seconds. b. The standard deviation for normal weight individuals was 82.95. c. c. The F - statistic, which shows if the assumption of homogeneity of variances has been violated, was 2.745 with a p - value of 0.106. The assumption was not violated 3. The effect size statistic must be computed by hand (or calculator). Use the second “easier” formula for d , found in the section on Effect Size Statistics in this lesson . (3 pts ) d = t √ ((N1+N2) / (N1N2)) d = - 3.975 √ ((10+30) / (10*30)) d = - 3.975 √ (40/300) d = - 3.975 (0.365) d = - 1.451 4. An independent t - test showed that there was a significant difference between the mean eating time for the two groups, t (38) = - 3.975, p < 0.001, d = - 1.451, in this sample. The mean eating time of a Big Mac special for overweight individuals ( M = 589, SD = 42.6) was shorter than the mean eating time for normal weight individuals ( M = 698, SD = 82.9). The alternative hypothesis that overweight individuals take less time to eat a Big Mac than normal weight individuals should be accepted. The null hypothesis that there is no difference in the eating time of the two groups should be rejected. 5. Create a boxplot (not an error bar graph) using the following steps (covered also in Lesson 21 ) . (3 pts ) Time spent eating Big Mac specials in seconds by Weight Category

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