Testing equality of means/medians (independent samples)

Test if there is a difference between the means/medians of two or more independent samples.

1. Select a cell in the dataset.
2. On the Analyse-it ribbon tab, in the Statistical Analyses group, click Compare Groups, and then click the hypothesis test.
   The analysis task pane opens.
3. In the Y drop-down list, select the quantitative response variable.
4. In the X drop-down list, select the categorical factor variable identifying the groups.
5. If performing a 2 sample hypothesis test:
   1. In the Hypotheses drop-down list, select the null and directional alternative hypotheses.
   2. In the Hypothesized difference edit box, type the expected difference under the null hypothesis.
6. If performing a k sample hypothesis test:
   1. In the Hypothesis drop-down list, select the null and alternative hypotheses.
7. Optional: To compare the p-value against a predefined significance level, in the Significance level edit box, type the maximum probability of rejecting the null hypothesis when in fact it is true (typically 5% or 1%).
8. Click Calculate.