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Test of mean

The mean wage of workers in a certain industry over the whole country is $210 per week, with a standard deviation of $7.50. A sample of 100 workers from one large factory is found to have a mean wage of $208 per week. Are the workers in this factory different from the rest of the industry?

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Ho : The mean wage of workers is $210 per week
H1 : The mean wage of workers is not $210 per week

Level of significance = 5%

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