Estimating a Population Standard Deviation or Variance

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Estimating a Population Standard Deviation or Variance

Use the given information to find the number of degrees of freedom, the critical values and , 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

%

confidence;

n,

s mg.

df=27

(Type a whole number.)

nothing

(Round to three decimal places as needed.)

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Estimating a Population Standard Deviation or Variance

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