A researcher compared the effects of free cafeteria meals on Mondays and employee absenteeism on Mondays. Data were collected for three months before and three months after this program was put into place. This is a description of what type of study?

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To address timing issues, some studies involve multiple measures of the dependent variable. These designs are indicated by the term time-series. In a cross-over design, the timing of treatment conditions is randomized to a single group of subjects. In a trend study, different samples from the same population are studied at different points of time in regard to the same variable(s) of interest.

A Researcher Compared the Effects of Free Cafeteria Meals on Mondays