Inference About Regression Coefficients

Click the link below and save the following JMP file to your Desktop:

Now go to your Desktop and double click on the JMP file you just downloaded.

This action will start JMP and display the content of this file:

Go to the **Analyze** menu and select **Fit Y by X**:

Click the column **Gross Sales**, then click **Y, Response**.

Click the column **Items**, then click **X, Factor**.

Your screen should now look similar to the following:

Click **OK**.

The scatter plot is produced:

Click on the red down arrow next to **Bivariate Fit of Gross Sales By Items**
and select **Fit Line**:

You should see:

The t Ratios, displayed in the **Parameter Estimates** output, are the t values for testing
the null hypothesis that
the corresponding population regression coefficients are zero. And, the
values under** Prob>|t| **are the p-values associated with the same tests
(and, with a 2-sided alternative hypothesis).

To get a 95% confidence intervals for the population regression coefficients,
right click on the **Parameter Estimates** area (below the words **Parameter
Estimates**).

Go to **Columns**, then select **Lower 95%,** then **Upper 95%** as follows: