Z Score Calculator: Standard Normal Distribution ...
https://www.zscorecalculator.comDescription: This calculator determines the area under the standard normal curve given z-Score values. The area represents probability and percentile values. The calculator allows area look up with out the use of tables or charts. In addition it provide a graph of the curve with shaded and filled area. The z-score is the number of standard ...
Z-test Calculator | Definition | Examples
https://www.omnicalculator.com/statistics/z-test04.04.2020 · You may use a Z-test if your sample consists of independent data points and:. the data is normally distributed, and you know the population variance;. or. the sample is large, and data follows a distribution which has a finite mean and variance.You don't need to know the population variance. The reason these two possibilities exist is that we want the test statistics …