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Finding the chi-square test statistic value for the given set of values

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

Work out the chi-square statistic.

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