One of the statistical methods is (z test).

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Ammar Kuti Nasser

Good, but how do we apply the z-test in SPSS?@

David L Morgan

It sounds like you should be using a t-Test rather than a z-test if you want to compare means.

David L Morgan But there is a z-test to measure the difference between two means.@

The most widely recognized standard for comparing two means is the t-Test. I don't know what else I can say beyond that.