An analysis of variance examines the interaction between two or more independent variables on a dependent variable. Computing a variance analyzes the differences between numbers by quantifying how far each number deviates from the mean of the data set. Interactions between independent variables can impact the dependent variable in complex ways that a two-way ANOVA can help uncover.

1. 1. As a health care professional in public health, describe some
examples that demonstrate the importance of interaction of
variables in a two-way analysis of variance. (300 word count)
2. Explain why computing a variance of several numbers is like
analyzing their differences. (300 word count)