Chapter 5: How Variables ClassifyJointly: Contingency Tables

Outline

• Binomial Distribution (demo)• One-Way Pivot Tables• Two-Way Pivot Tables• Cross-Tabulation

Binomial / Bernoulli Distribution

1654-1705

Binomial Formula

Excel Binomial Distribution

Excel Binomial Distribution

Cell Phone Quality ControlYour company will be satisfied if only 1% of its phones fail to establish a connection with a cell tower that’s within reach.

Goal Sample Prediction

1000 50 ?

1% 4% ?

10 2 ?

Understanding One-Way Pivot Tables

Using the BINOM.DIST() Function

Understanding Two-Way Pivot Tables

CategoricalProportions

Z-Test Proportions

A chi-square test for equality of two proportions is exactly the same thing as a z-test.

Chi-Square vs. Z-Test Proporations