Educational Psychology PhD - EPSY 6303 Educational Measurement Module 4: Reliability Assignment 3

Overview of Assignment 3

Educational Psychology PhD EPSY 6303 Educational Measurement Module 4: Reliability Order: Assignment 3 • (SPSS) assignment3.sav (attached ) Assignment 3 1. Use the data in assignment3.sav to estimate the reliability of this scale, which measures students’ views on the utility of math and science courses 2. Use software to obtain the confidence interval for Alpha. 3. Obtain the reliability if item removed. 4. Write a brief report on your findings focusing on the overall reliability of the scale and including a discussion of which items may be problematic and why. 5. Calculate the reliability estimates using the Spearman-Brown formula 1) Given a 20-item test with reliability=.60, what would be the reliability if the test length were tripled (i.e., made three times longer)? 2) Given a 30-item test with reliability=.90, what would be the reliability if the test length were reduced to only 10 items? - Variable view of “assignment3.sav” data Assignment 3: Download (Word File) ASSIGNMENT 3 ASSIGNMENT 3 - Alternative Formats Dataset: • (SPSS) assignment3.sav Assignment 3 1. Use the data in assignment3.sav to estimate the reliability of this scale, which measures students’ views on the utility of math and science courses 2. Use software to obtain the confidence interval for Alpha. 3. Obtain the reliability if item removed. 4. Write a brief report on your findings focusing on the overall reliability of the scale and including a discussion of which items may be problematic and why. 5. Calculate the reliability estimates using the Spearman-Brown formula o Given a 20-item test with reliability=.60, what would be the reliability if the test length were tripled (i.e., made three times longer)? Given a 30-item test with reliability=.90, what would be the reliability if the test length were reduced to only 10 items? Module 4: Reliability Content MODULE 4: RELIABILTY OBJECTIVES At the end of this module, Students should be able to: Explain the relationship between measurement error and reliability o Explain the different ways reliability can be estimated: alternative forms, test-retest, split-half, and internal-consistency Be familiar with and know how to apply these formulas: ? Coefficient alpha ? KR-20 ? The Spearman-Brown formula ACTIVITY I TOPIC: Reliability Lecture Video: You can download the presentation slides here: Presentation Presentation - Alternative Formats ACTIVITY II LAB EXERCISES Lab Exercise 1: Use the “lab4.sav” data to conduct a reliability analysis.  Make sure to obtain estimates for reliability using split halves and Cronbach’s Alpha. Use software to obtain the confidence interval for Alpha.  Obtain the reliability if item removed Lab Exercise 2: Spearman-Brown prophecy formula Dataset:  (SPSS) lab4.sav Presentation Video: You can download the presentation slides here: Presentation Presentation - Alternative Formats ASSIGNMENT Assignment 3: Download (Word File) ASSIGNMENT 3 ASSIGNMENT 3 - Alternative Formats Dataset:  (SPSS) assignment3.sav Assignment 3 Use the data in assignment3.sav to estimate the reliability of this scale, which measures students’ views on the utility of math and science courses o Use software to obtain the confidence interval for Alpha. Obtain the reliability if item removed. Write a brief report on your findings focusing on the overall reliability of the scale and including a discussion of which items may be problematic and why. Calculate the reliability estimates using the Spearman-Brown formula ? Given a 20-item test with reliability=.60, what would be the reliability if the test length were tripled (i.e., made three times longer)? ? Given a 30-item test with reliability=.90, what would be the reliability if the test length were reduced to only 10 items? RESOURCES Albano , Anthony D. (2018). Introduction to Educational and Psychological Measurement Using R ? Chapter 5: Reliability . Assignment 3