SOLUTION: A simple random sample of 25 cigarettes has a mean tar content of 19.2 and a standard deviation of 4.27. Use a 5% signifiance level to test the claim that the mean tar c

Question 872533: A simple random sample of 25 cigarettes has a mean tar content of 19.2 and a standard deviation of
4.27. Use a 5% signifiance level to test the claim that the mean tar content is less than 21.1

Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!



Hi



sample 25, mean = 19.2, sd = 4.27

Ho: x  ≥  21.1

Ha: x < 21.1 claim

t = (19.2 - 21.1)/(4.27/sqrt(25) = -1.9/.854 = -2.225

p-value(t < -2.225) (df = 24) = .0179

Reject Ho, The claim that x < 21.1 is valid  (.0179 < .05) 

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