To test the two different population income
A study conducted on the annual incomes of Teachers in the state of California in metropolitan areas having a population less than 100,000 and in metropolitan areas having a population over 500,000. Some sample statistics are:
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SAMPLE STATISTIC
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POPULATION LESS THAN 100K
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POPULATION MORE THAN 500K
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Sample Size
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45
|
60
|
|
Sample mean
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$46,289
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$53,2750
|
|
Sample SD
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$1,060
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$1,900
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Test the hypothesis that the annual incomes of Teachers in areas of more than 500,000 are significantly more than those in areas of less than 100,000. Use the 5 percent level of risk.