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We would use a two-way ANOVA for this analysis because we have two factors. the effect that sunlight exposure has on the plants is dependent on watering frequency) Is there an interaction effect between sunlight exposure and watering frequency? (e.g.Does watering frequency affect plant growth?.Does sunlight exposure affect plant growth?.Factors: sunlight exposure, watering frequencyĪnd we would like to answer the following questions:.In this case, we have the following variables: You should use a two-way ANOVA when you’d like to know how two factors affect a response variable and whether or not there is an interaction effect between the two factors on the response variable.įor example, suppose a botanist wants to explore how sunlight exposure and watering frequency affect plant growth.
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A two-way ANOVA (“analysis of variance”) is used to determine whether or not there is a statistically significant difference between the means of three or more independent groups that have been split on two variables (sometimes called “factors”).
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