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Z-test is a statistical test where normal distribution is applied and is basically used for dealing with problems relating to large samples when n â¥ 30. Don't miss these related articles: 1  1 ANOVA.
Best Answer: You don't need any degrees of freedom for z tests! Degrees of freedom are important when viewing your t table. They will help you locate the critical values of the t-distribution.est Answer: You don't need any degrees of freedom for z tests! Degrees of freedom are important when viewing your t table. They will help you locate the critical values of the t-distribution.