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One possible side effect of air pollution is genetic damage. A study designed to examine this problem exposed one group of mice air near a steel mill and another group to air in a rural area. The study compared the number of Hm-2 gene mutations in each group. The data table is below.
| Location | ||
| Mutation | Steel Mill Air | Rural Air |
| Yes | 30 | 23 |
| No | ||
| Total | 96 | 150 |
Calculate the chi-square statistic.