Paper 1 · Research Aptitude
To test a null hypothesis about the association between two categorical variables, a researcher uses
AThe t-test
BANOVA
CThe chi-square test ✓ Correct
DFactorial analysis
Correct answer: (C) The chi-square test — To test such a null hypothesis, the chi-square test is used, so that is the answer.
Explanation
★To test such a null hypothesis, the chi-square test is used, so that is the answer.
★The chi-square test compares observed frequencies with those expected under the null hypothesis.
★So it checks whether two categorical variables are independent or associated.
★The t-test compares the means of two groups on a numerical variable, a different use.
★ANOVA compares the means of three or more groups, again on numerical data.
★Factorial analysis is not a null-hypothesis test of this kind, so the chi-square test is used.
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