# 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

**Casio - SL: the 2-sample 'pooled' T-test**

**TiNspire - SL: the 2-sample 'pooled' Ttest**

#### Ti-84

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**

**Casio: SSR**

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

**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.

**METHOD 2: Turn on 'Residuals', Square & sum them**

**METHOD 2: Turn on 'Residuals', Square & sum them**

**TiNspire: SSR = stat.resid²**

**TiNspire: SSR = stat.resid²**