This scatterplot displays your data along with a least squares regression line. Sample statistics are on the right. As samples are drawn, the sampled points change color and a regression line fit to those sample points is drawn on the scatterplot. The value of the sample slope is shown on the right and that value is added to the histogram below. To draw more than a single sample at a time, set the Number of Samples to Draw and click Run.
This histogram displays the slopes of the samples. As more samples accumulate, it shows a simulated sampling distribution of the regression slope for these data. The limiting lines capture a central region (by default 95%). Lines in the upper scatterplot correspond to this region, so if you change the flag locations, the corresponding slopes show on the scatterplot.
You can drag the flags that define the tails by clicking and dragging them.
Alternatively, you can use the keyboard. Make sure you have one of the tails in focus, you can do this by clicking the lower histogram or by navigating to it using th tab key. Once you've focused on the lower histogram, you control the left tail with the left and right arrow keys. On their own, the arrow keys move the left tail Three sample at a time. You can move 1% of the total samples at a time by holding the shift key with the left or right arrow keys. You can move 10% of the total samples at a time by holding Control and Shift at the same time as pressing the left or right key.