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A nationwide report claims that 82% of adult Canadians have had their wisdom teeth removed. A survey in a particular town finds that in a

A nationwide report claims that 82% of adult Canadians have had their wisdom teeth removed. A survey in a particular town finds that in a random sample of 78 adults, 70 of them have had their wisdom teeth removed. Test the claim that the proportion of people in the town who have had their wisdom teeth removed differs from the nationwide proportion.

how do i calculate the observed value of the test statistic?

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