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Using the value in the given data table finding the missing 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

a. State the null hypothesis.

b. Fill in the missing entries.

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