t-distribution Probability
  This is similar to the Normal distribution active table. Tab to move between the editable boxes, and press Enter or Return to register your new typing. The minimum and maximum numbers are ±3.5 but the shape of the t distribution curve does not change appreciably with different values. The options for displaying the probabilities are T < t, T > t, T < -t + T > t, and -t < T < t.