The diagram below gives practice with the process of assessing a sample slope.
- Evaluate the t-value using the green template at the top right.
- Set the degrees of freedom with the slider.
- Drag over the t-distribution to find the probability of getting
a t-value less than this.
- The p-value is twice the tail area; type this value into the p-value box
at the bottom right.
- Select your conclusion about the strength of evidence against a zero slope,
then click Check
Click Another and repeat with other data sets until you are confident with
the method.