Command Summary

Finds the probability of an interval of the Student's t distribution, and graphs the distribution with the interval's area shaded.

Command Syntax

Press:

1. 2ND DISTR to access the distribution menu
2. RIGHT to select the DRAW submenu
3. 2 to select Shade_t(, or use arrows

TI-83/84/+/SE

2 bytes

Shade_t( is equivalent to tcdf( in terms of the probability it calculates: if a random variable follows the Student's t distribution, you can use it to calculate the probability that the variable's value falls in a certain interval. However, in addition to calculating the probability, this command also draws the distribution, and shades the interval whose area represents the probability you want.

Note that this command does not actually return the value it calculates in Ans or anywhere else: it's merely displayed on the graph. If you're going to use the value in further calculations, you'll have to use tcdf( as well.

Like tcdf(, Shade_t( takes three arguments: the lower bound, the upper bound, and the degrees of freedom.
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