Use the given information to find the number of degrees offreedom, the critical values 2L and 2R, and the confidence interval estimate of . It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution.

Nicotine in menthol cigarettes 95% confidence; n=27, s=0.29 mg.

df=

2L=

2R=

The confidence interval estimate of is mg << mg.

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