Topic: Unit 4: Inference for Quantitative Data: Means

Worked Example: Before and After Tutoring Scores

Why We Use t Instead of z for Means

Why Huge Samples Make Tiny Differences Significant

What Makes Data Paired

Using the TInterval Calculator Function

Using 2-SampTTest on the Calculator

Unusual Sample Means and the Z-Score of x-bar

Two-Sample Versus Paired Test on the Same Numbers

The Logic of a Significance Test for a Mean

Sampling Distribution of a Sample Mean Defined