Test for Homogeneity · Example 2

Both before and after a recent earthquake, surveys were conducted asking voters which of the three candidates they planned on voting for in the upcoming city council election. Has there been a change since the earthquake? Use a level of significance of 0.05. shows the results of the survey. Has there been a change in the distribution of voter preferences since the earthquake?

$$\begin{array}{cccc}& \text{Perez}& \text{Chung}& \text{Stevens}\\ \text{Before}& \text{167}& \text{128}& \text{135}\\ \text{After}& \text{214}& \text{197}& \text{225}\end{array}$$

OpenStax, Introductory Statistics 2e · §11.4 Test for Homogeneity · Example 2