The BOP should always balance

Fortunately, when testing for differences, you will not need to be concerned whether to use the t or z test because:

a) the z is easier to calculate and to interpret and should always be used. b) the t is more widely known among statisticians and should always be used. c) assumptions of the z and t are minimal and are of concern only to statisticians. d) SPSS, and most statistical software packages, are programmed to use the correct statistic.

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