You can easily test the hypothesis with a little data information. Hypothesis tests of single population means are performed according to the z and t distributions. This app supports English and Korean. The test can be selected by selecting 90%, 95%, or 99% confidence intervals. When testing, you can check the graph. Have fun hypothesis testing. z-distribution and t-distribution data are stored in SQLite and are automatically checked during the test. This app can be used both when you know