You also learned about the step by step procedure to apply $Z$-test for testing two population means and how to use $Z$-test calculator for testing two population means to get the value of test statistic, p-value, and z-critical value. In this tutorial, you learned the about how to solve numerical examples on $Z$-test for testing two population means. There is no significant difference between the average tensile strength of the threads from two brands. Step 1 - Enter the sample mean for first sample $\overline$ the null hypothesis. of Means: Test Statistics Z: Z-critical value(s): p-value: How to use $z$-test calculator for testing two means? Two tailed Calculate Results Standard Error of Diff. Z test Calculator for two means Sample 1 Sample 2 Sample Mean Standard Deviation Sample Size Level of Significance ($\alpha$) Tail Left tailed
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