Discussion
Chi-square test is used
Answer: B
The chi-square test is used when the data are in frequencies. It compares observed counts in categories with the counts expected on a hypothesis, as in the test of goodness of fit, or tests whether two attributes in a table of frequencies are independent. It is not limited to two groups, so option A is wrong, and it is not specific to three or more groups, so option D is wrong. It is not a check of the accuracy of data, so option C is wrong. The keyed answer is option B.
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