Z-TEST OF PROPORTIONS AND MEANS

Similarly, the z-test for means can be applied using the following:

The hypotheses tested are typically:

H0: μ1 = μ2 that is, the two samples’ means are statistically similar

Ha: μ1 ≠ μ2 that is, the two samples’ means are statistically significantly different

This test is the alternative to the unequal variances t-test whenever both n1 and n ≥ 30.

The test can also be performed using ROV BizStats.

Figure 9.12: ROV BizStats’ Z-Test for Proportions

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