To enter the Inference application, highlight the app using the directional keys. Press the ok key to enter the application. This app allows you to perform hypothesis tests and construct confidence intervals.
The first screen of the application allows you to choose between Tests and Intervals.
This section allows you to perform hypothesis tests. The following types of tests are available:
For each of these tests, the interface first allows you to define your null hypothesis and your alternative hypothesis (this step is implicit in the chi-square test). You then enter your sample data.
The calculator then calculates the test statistic and P-value. A graphical representation is also available with the P-value and rejection region shaded.
This section is used to construct confidence intervals. The following types of intervals are available:
For each of these types of intervals, you are first prompted to enter sample data. The calculator then provides the critical value, standard error and margin of error. It also provides the endpoints of the interval as well as a visual representation.
You can then use the copy key to copy the calculated interval and paste it into another application.