Running a Reliability Analysis

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Run a reliability analysis using the Lesson 37 Exercise File 1. Specifically, you are to:

• Reverse scale the appropriate items so that a higher total score reflects a greater emphasis on career.
• Compute a reliability analysis on the total score, using coefficient alpha.
• Conduct the analysis again, this time computing a split-half reliability coefficient and justify the method you used to split the items.
• Identify which estimate of reliability is the more appropriate one and why.

To prepare for this Assignment:

• Consider which reliability analysis will be most informative for your research.
• Review Lessons 37 and 38 in the Green and Salkind text:
• Lesson 37, "Internal Consistency and Estimates of Reliability"
• Lesson 38, "Item Analysis Using Reliability Procedure"
• Access Lesson 37 Exercise File 1 from the Pearson website: http://www.pearsonhighered.com/greensalkindSPSS
• Review the Assignment Exemplar document provided in this week’s Learning Resources.

Submit a 3- to 4-page paper using the Assignment Exemplar.

Your paper must include the following elements:

• An APA Results Section based upon your analyses (see pages 299–300 of the Green and Salkind text as an example)
• An appendix including the SPSS output generated for the reliability analysis (see page 299 of the Green and Salkind text)

Run a reliability analysis using the Lesson 37 Exercise File 1. Specifically, you are to: • Reverse scale the appropriate items so that a higher total score reflects a greater emphasis on career. • Compute a reliability analysis on the total score, using coefficient alpha. • Conduct the analysis again, this time computing a split-half reliability coefficient and justify the method you used to split the items. • Identify which estimate of reliability is the more appropriate one and why. To prepare for this Assignment: • Consider which reliability analysis will be most informative for your DIT research. • Review Lessons 37 and 38 in the Green and Salkind text: o Lesson 37, "Internal Consistency and Estimates of Reliability" o Lesson 38, "Item Analysis Using Reliability Procedure" • Access Lesson 37 Exercise File 1 from the Pearson website: http://www.pearsonhighered.com/greensalkindSPSS • Review the Assignment Exemplar document provided in this week’s Learning Resources. Submit a 3- to 4-page paper using the Assignment Exemplar. Your paper must include the following elements: • An APA Results Section based upon your analyses (see pages 299–300 of the Green and Salkind text as an example) • An appendix including the SPSS output generated for the reliability analysis (see page 299 of the Green and Salkind text) Complete Student submits a 3- to 4-page paper using the Assignment Exemplar. Results Section Student presents an APA Results Section based upon analysis of the reliability. Appendix Student presents an appendix which includes the SPSS output generated for the reliability analysis.
1 Week Seven Reliability Analysis Exemplar Template Research Question Is the emotional control scale a reliable instrument? Hypotheses H0: The Emotional Control Scale is not a reliable instrument. H1: The Emotional Control Scale is a reliable instrument. Results Two internal consistency estimates of reliability were computed for the Emotional Control scale: a split-half coefficient expressed as a Spearman-Brown corrected correlation and coefficient alpha. For the split-half coefficient, the scale was split into two halves such that the two halves would be as equivalent as possible. In splitting the items, we took into account the sequencing of the items as well as whether items assessed control of emotion or expression of emotion. One of the halves included items 1, 3, 5, 8, and 10, while the other half included items 2, 4, 6, 7, and 9. Values for coefficient alpha and the split half coefficient were the same, .87, each indicating satisfactory reliability. The XXXX method is most appropriate because (justify the most appropriate method). Appendix A depicts the SPSS output generated from the coefficient alpha analysis. Appendix B depicts the SPSS output generated from the split-half reliability analysis. 2 Appendix A Reliability Statistics Cronbach's Alpha Cronbach's Alpha Based on Standardized Items .872 .872 N of Items 10 Item Statistics item1 item2 item3 item4 item5 item6 item7 item8 item9 item10 Mean Std. Deviation 1.92 1.307 2.16 1.201 2.20 .990 1.98 1.301 2.00 1.143 2.20 1.278 2.34 1.118 2.10 1.249 2.34 1.118 2.08 1.291 N 50 50 50 50 50 50 50 50 50 50 3 Inter-Item Correlation Matrix item1 item2 item3 item4 item5 item6 item7 item8 item9 item10 item1 1.000 .463 .470 .407 .451 .352 .452 .517 .368 .427 item2 .463 1.000 .419 .446 .520 .378 .460 .560 .308 .439 item3r .470 .419 1.000 .463 .307 .436 .472 .446 .417 .259 item4r .407 .446 .463 1.000 .453 .481 .426 .365 .285 .475 item5 .451 .520 .307 .453 1.000 .405 .192 .500 .224 .401 item6r .352 .378 .436 .481 .405 1.000 .409 .537 .209 .312 item7 .452 .460 .472 .426 .192 .409 1.000 .487 .445 .334 item8r .517 .560 .446 .365 .500 .537 .487 1.000 .267 .450 item9r .368 .308 .417 .285 .224 .209 .445 .267 1.000 .348 item10 .427 .439 .259 .475 .401 .312 .334 .450 .348 1.000 4 Appendix B Reliability Statistics Part 1 Cronbach's Alpha Part 2 Total N of Items Correlation Between Forms Spearman-Brown Coefficient Equal Length Unequal Length Guttman Split-Half Coefficient a. The items are: item1, item3, item5, item8, item10. b. The items are: item2, item4, item6, item7, item9. Value N of Items Value N of Items .786 5a .757 5b 10 .775 .873 .873 .873

FelixBrato
School: Purdue University

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Anonymous
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