When a researcher wants to compare the averages of several (more than two)groups,he or she should use:
A)multiple tests of differences between two averages
B)three way differences tests
C)analysis of variance
D)analysis of covariance
E)multiple z tests

Question

Quizplus · Accepted Answer

Analysis of variance (ANOVA) is the appropriate choice when wanting to compare the averages of several groups. It allows for testing the null hypothesis that there is no significant difference between the means of the groups. ANOVA is more efficient and less prone to Type I errors, compared to conducting multiple tests of differences between two averages. Three way differences tests and analysis of covariance are alternative statistical methods that may be suitable for specific research questions but are not the primary choice for comparing averages of several groups. Multiple z tests are used when comparing a single sample mean to a known population mean, and are not appropriate for comparing means of several groups.

When a Researcher Wants to Compare the Averages of Several