Recall & Review
beginner
What does ANOVA stand for and what is its main purpose?
ANOVA stands for Analysis of Variance. It is used to compare the means of three or more groups to see if at least one group mean is different from the others.
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beginner
In R, which function is commonly used to perform a one-way ANOVA?
The
aov() function is commonly used in R to perform a one-way ANOVA.Click to reveal answer
beginner
What is the null hypothesis in an ANOVA test?
The null hypothesis states that all group means are equal, meaning there is no difference between the groups.
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beginner
What does a significant ANOVA result tell you?
A significant ANOVA result means that at least one group mean is different from the others, so the groups are not all the same.
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intermediate
How do you check the assumptions of ANOVA in R?
You check assumptions by looking at residual plots for normality and equal variance, and you can use tests like Shapiro-Wilk for normality and Levene's test for equal variances.
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Which R function is used to perform a one-way ANOVA?
✗ Incorrect
The
aov() function is designed for ANOVA tests in R.What does a low p-value in ANOVA indicate?
✗ Incorrect
A low p-value means we reject the null hypothesis that all means are equal.
Which assumption is NOT required for ANOVA?
✗ Incorrect
Groups do not need the same sample size, but other assumptions must hold.
What is the null hypothesis in ANOVA?
✗ Incorrect
ANOVA tests if all group means are equal (null hypothesis).
Which test can be used to check equal variances in ANOVA?
✗ Incorrect
Levene's test checks if variances are equal across groups.
Explain the purpose of ANOVA and how it differs from a t-test.
Think about how many groups each test compares.
You got /4 concepts.
Describe the key assumptions you must check before trusting ANOVA results.
Consider what could affect the accuracy of ANOVA.
You got /4 concepts.