A researcher wants to compare differences in hospital length of stay for preterm infants who are randomly assigned to four different methods of stimulation. Which statistical test should be used in this situation?

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One-way ANOVA is used is to compare the mean value for an interval- or ratio-level variable for three or more groups. ANCOVA compares mean performance while controlling for the effects of a covariate. Factorial ANOVA examines the main and interaction effects of two or more independent variables.

A Researcher Wants to Compare Differences in Hospital Length of Stay