With a differences test,the researcher tests the null hypothesis that no differences exist between the two group means(or percentages).

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A differences test, also known as a t-test or z-test, is used to determine if there is a statistically significant difference between the means or percentages of two groups. The null hypothesis is that there are no differences between the two groups, and the alternative hypothesis is that there is a significant difference. The researcher uses the results of the test to either reject or fail to reject the null hypothesis.

With a Differences Test,the Researcher Tests the Null Hypothesis That