DA0-002 Data Analysis Practice Question
A data analyst is performing a chi-square test for independence between two categorical variables. Which THREE of the following are necessary conditions for the test to be valid?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Sample is randomly selected
The chi-square test requires expected frequencies ≥5, random sampling, and independence of observations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Variances are equal across groups
Why it's wrong here
Equal variances is not an assumption for chi-square.
- ✗
Data is normally distributed
Why it's wrong here
Chi-square does not require normality.
- ✓
Sample is randomly selected
Why this is correct
Correct condition.
- ✓
Observations are independent
Why this is correct
Correct condition.
- ✓
Expected frequency in each cell is at least 5
Why this is correct
Correct condition.
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