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  3. the mayor of a large city claims that 25 % of the

The mayor of a large city claims that 25 % of the families in the city...

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Basic Math

The mayor of a large city claims that 25 % of the families inthe city earn more than $ 100,000 per year; 55 % earn between $30,000 and $ 100,000 (inclusive); 20 % earn less than $ 30,000 peryear.

In order to test the mayor’s claim, 285 families from the cityare surveyed and it is found that:

90 of the families earn more than $ 100,000 per year;
135 of the families earn between $ 30,000 and $ 100,000 per year(inclusive);
60 of the families earn less $ 30,000.

Test the mayor’s claim based on 2.5 % significance level.

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