A Researcher Uses a Single-Factor ANCOVA to Analyze a Pretest-Posttest

Multiple Choice

A researcher uses a single-factor ANCOVA to analyze a pretest-posttest design. The between-groups IV has three levels. There is a significant F value. The researcher should:

A) Use multiple t tests to interpret the results
B) Use a Tukey HSD post hoc test to interpret the results
C) Use simple main effects analysis to interpret the interaction
D) Graph the pretest and posttest means for comparison