SPSS Homework Independent-Samples t Test Assignment_NGold (OLD)

PSYC 355 SPSS: I NDEPENDENT -S AMPLES T T EST A SSIGNMENT I NSTRUCTIONS External Locus of Control Internal Locus of Control 25 23 17 19 18 26 19 21 28 23 23 22 20 23 16 12 14 14 21 19 14 10 20 1. Paste SPSS output. (10 pts) Group Statistics Locus of Control N Mean Std. Deviation Std. Error Mean ATSPPH-SF External 12 22.00 3.357 .969 Internal 11 16.64 4.178 1.260 Problem Set 1: The independent-samples t test Research Scenario: A counselor is interested in evaluating the attitudes that different groups attach to seeking mental health treatment. Specifically, she wants to evaluate the theory that people with an external locus of control (ELOC) have more positive attitudes towards seeking treatment than people with an internal locus of control (ILOC). She administers a measure called the Attitudes Toward Seeking Professional Psychological Help-Short Form (ATSPPH- SF; Fischer & Farina, 1995) to a sample of 23 participants, who have been screened and assigned to groups based on their prevalent personal theory of locus of control. On the ATSPPH-SF, higher scores indicate more positive attitudes towards seeking mental health treatment. The results are in the table below. Using this table, enter the data into a new SPSS data file and run an independent- samples t test to determine whether those with an ELOC have more positive attitudes towards mental health treatment than those with an ILOC. Create a boxplot to show the difference between the groups. Follow the directions below the table to complete the homework.

PSYC 355 Independent Samples Test Levene's Test for Equality of Variances t-test for Equality of Means F Sig. t df Significance Mean Difference Std. Error Difference 95% Confidence Interval of the Difference One- Sided p Two- Sided p Lower Upper ATSPPH -SF Equal variances assumed 1.502 .234 3.408 21 .001 .003 5.364 1.574 2.091 8.637 Equal variances not assumed 3.375 19.221 .002 .003 5.364 1.589 2.040 8.688 2. Write an APA-style Results section based on your analysis. Include your boxplot as an APA-style Figure, with figure number and title, as demonstrated in the Results section presentation. (Results = 12 pts; Figure = 8 pts) Results An independent-samples t test was conducted to determine the effect of different locus of controls (External, Internal) on attitudes towards seeking mental health treatment for adult participants assigned to groups based on their prevalent personal theory of locus of control. Figure 1 illustrates the distributions of attitudes for each group. The results indicate a significant difference between the group of External Locus of Control (M = 22.0, SD = 3.36) and the group of Internal Locus of Control (M = 16.6, SD = 4.18), t(21) = 3.4, p = .001. The 95% confidence interval of the difference between means ranged from 2.09 to 8.64 and does indicate a more positive difference between the sample means. We therefore reject the null hypothesis that there is no or a less positive attitude between the two locus of controls. Figure 1 ATSPPH-SF by Locus of Control