A5.2 Test Whether the Percentages for the Two Groups Are Significantly Different
With a significance level of 0.05 (z value = 0.96) and an average sample size of 75, the hurdle for a significance difference between the two groups is 11.3% (i.e., the square root of 0.96/75). Thus the responses of two groups are significantly different for an item when their percentages differ by at least 11.3%.
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