3. A national newspaper writes an article that claims the average American gets their first tattoo at 24 years old. A local tattoo parlor thinks the mean in the area is less than that. A random sample of 24 people with tattoos gives a mean age of 22.5 for their first tattoo with a standard deviation of 4.5. Assume age of first tattoo is normally distributed. Conduct a hypothesis test with significance level 0.05 to test the tattoo parlor's claim. (Make sure to include everything for a hypothesis test. You may use either method to determine whether to reject the null hypothesis.)

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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3. A national newspaper writes an article that claims the average
American gets their first tattoo at 24 years old. A local tattoo parlor
thinks the mean in the area is less than that. A random sample of 24
people with tattoos gives a mean age of 22.5 for their first tattoo with a
standard deviation of 4.5. Assume age of first tattoo is normally
distributed.
Conduct a hypothesis test with significance level 0.05 to test the tattoo
parlor's claim. (Make sure to include everything for a hypothesis test.
You may use either method to determine whether to reject the null
hypothesis.)
Transcribed Image Text:3. A national newspaper writes an article that claims the average American gets their first tattoo at 24 years old. A local tattoo parlor thinks the mean in the area is less than that. A random sample of 24 people with tattoos gives a mean age of 22.5 for their first tattoo with a standard deviation of 4.5. Assume age of first tattoo is normally distributed. Conduct a hypothesis test with significance level 0.05 to test the tattoo parlor's claim. (Make sure to include everything for a hypothesis test. You may use either method to determine whether to reject the null hypothesis.)
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