[Solved] Which of the following hypotheses does the Chi-squared test evaluate? — Ans: Null hypothesis that observed and expected frequencies are the same | SciPy

SciPy - Statistical Tests

Which of the following hypotheses does the Chi-squared test evaluate?

ANull hypothesis that observed and expected frequencies are the same

BAlternative hypothesis that means are equal

CNull hypothesis that two variables are linearly related

DAlternative hypothesis that variances are equal

Step-by-Step Solution

Solution:

Step 1: Recall Chi-squared test hypotheses
The test checks if observed frequencies match expected frequencies under the null hypothesis.
Step 2: Match the correct hypothesis
The null hypothesis states no difference between observed and expected counts.
Final Answer:
Null hypothesis that observed and expected frequencies are the same -> Option A
Quick Check:
Chi-squared null hypothesis = observed equals expected [OK]

Quick Trick: Null hypothesis always states no difference in Chi-squared test [OK]

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Which of the following hypotheses does the Chi-squared test evaluate?