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Main Effect and Interaction Effect in Analysis of Variance

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Sarah performs an experiment to determine the best amount of sun and water for a certain type of plant. She varies the amount of water the plants get each day and also how much time they are in the sun. At the end of six weeks, she measures how tall each plant is. What is the independent variable in this experiment?

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1. Sarah performs an experiment to determine the best amount of sun and water for a certain type of plant. She varies the amount of water the plants get each day and also how much time they are in the sun. At the end of six weeks, she measures how tall each plant is. Which of these is an example of an interaction effect that this experiment might detect?

2. In an experiment in which there are two independent variables, how many effects will an ANOVA test for?

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About This Quiz & Worksheet

For this quiz and worksheet combination, you are looking at the main effect and interaction effect as they appear in an analysis of variance, or ANOVA. Questions ask about the independent variable in an experiment and the use of a two-way ANOVA.

Quiz & Worksheet Goals

You can find the following subjects in question form during the quiz:

  • Interaction effects detected by an experiment
  • The number of effects with two independent variables
  • Calculating the F-ratio
  • Using a two-way ANOVA

Skills Practiced

  • Knowledge application - use what you know to answer questions about F-ratios
  • Information recall - remember what you have learned about independent variables
  • Making connections - see when you would need to use a two-way ANOVA

Additional Learning

To explore more about the effects, open the lesson titled Main Effect and Interaction Effect in Analysis of Variance, which shows you the following additional material:

  • Dependent variables
  • Number of effects
  • A definition for ANOVA
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