Question

6) When ANOVA F-test suggests that the population means differ, we can examine confidence intervals estimating each population mean to try to determine which population means account for the difference. These are the same one-sample T- intervals we learned in Unit 9. The fictitious data from Study #2 give these 95% confidence intervals. Which population means appear to differ? Which might be the same? Table of confidence interval calculation 1 Grade Sample Mean Std. Err. DF L. Limit U. Limit Three 11.4 0.8 20 9.7 13.1 Five 15.1 1.5 21 11.9 18 3 Seven 18.5 1.8 18 14.8 22.3 (Note: Statisticians actually use more sophisticated statistical techniques called "multiple comparisons to identify differences, but we will not study those techniques in this introductory statistics course.) 5

Answer 1