When we test for the differences between percentages for two groups the null hypothesis is that the difference in the two group's population parameters is over 30.

Question

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The statement is not correct. The null hypothesis is usually that there is no significant difference between the percentages in the two groups, and it is the alternative hypothesis that suggests there is a difference beyond chance variation. Additionally, the value of 30 has no relevance to this hypothesis test.

When We Test for the Differences Between Percentages for Two