Question
Both before and after a recent earthquake, surveys asked voters which of three candidates they planned to support in an upcoming city council election. The frequency table shows the results of the survey.
| Survey time | Perez | Chung | Stevens |
|---|---|---|---|
| Before | 167 | 128 | 135 |
| After | 214 | 197 | 225 |
At the α = 0.05 significance level, has the distribution of voter preferences changed since the earthquake?
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Evidence boundary
题面、观测频数、显著性水平和教材核对答案来自 OpenStax；期望频数、逐格贡献及舍入值是根据这些数据计算得出。结论只说明证据不足以认定分布改变，不声称证明“完全没有改变”。