1. Estimating Reliability Test-Retest Coefficient Parallel-Forms Coefficient Internal Consistency Coefficient Interrater (interobserver) Reliability © 2015 M. Guthrie Yarwood

2. Test-Retest Coefficient © 2015 M. Guthrie Yarwood Time 1: Extraversion Test September 1, 2015 Time 2: Extraversion Test October 1, 2015 correlate

3. Parallel Forms Coefficient © 2015 M. Guthrie Yarwood Time 1: Extraversion Form A September 1, 2015 Time 2: Extraversion Form B October 1, 2015 correlate

4. Internal Consistency Coefficient © 2015 M. Guthrie Yarwood Item #1 Item #2 Item #3 Item #4

5. Internal Consistency Coefficient © 2015 M. Guthrie Yarwood Item #1 Item #2 Item #3 Item #4 correlate Item #1 Item #2 Item #3 Item #4 Item #1 Item #2 Item #3 Item #4

6. Interrater Reliability © 2015 M. Guthrie Yarwood Participant#1Participant #2Participant #3Participant #4 Coder #1 4.54.64.84.7 Coder #2 4.84.94.74.6 Coder #3 2.01.52.35.0