# Stats & Probability GDC

Video Tutorials/Activities for the TiNspire and Casio (HP Prime to follow . . . .).

Below you will find links to a growing number of video tutorials (or key screenshots) on how to use your TiNspire or Casio calculator, for the Statistics and probability module.

### T-test

#### Ti-84In IB exams it is assumed that the standard deviation of both sets of data and approximately equal, therefore students will ALWAYS select "pooled"

Select POOLED: "YES" - where the video below chooses "no".

Apologies for the name of the channel from which the above video comes (it may make some students feel less alone though . . . and help change their view!).

### Sum of Squared Residuals (SSR)

#### Casio: SSR

##### METHOD 1: MSE x (n-p)   [n=sample/n° of pieces of data, p=n° of parameters(coefficients+constants in the model)]

It's important to be aware: regression coefficients and SSR values are likely to differ if you use the same data, but to a different degree of accuracy. Do not assume you have incorrectly followed the process if your answers differ by
only a little, the most common reason is using a different level of accuracy in the data that was entered.

#### TiNspire: SSR = stat.resid²

##### ExampleCHECK: This is the same answer as given by the Casio above (using the same data)
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