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The mean age of smoking initation in your community is 17. You believe this is signifcantly higher than the national average, which is 15 years,

The mean age of smoking initation in your community is 17. You believe this is signifcantly higher than the national average, which is 15 years, with a population standard deviation of 2. Use the five-step process to determine if you are correct using a single-sample z test. and 95% confidence level. Interpret your finding.

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