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Plumbers average 10.2 years of experience. In a random sample, 203 New Jersey plumbers average 8.7 years of experience, with a standard deviation of 0.52.

Plumbers average 10.2 years of experience. In a random sample, 203 New Jersey plumbers average 8.7 years of experience, with a standard deviation of 0.52. Are New Jersey plumbers significantly less experienced than the population?

Part 2: The same sample of New Jersey plumbers reports an annual salary of $25,782, with a standard deviation of $622. Is this figure significantly higher than the national average of $24,509?

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