Question

In: Math

Use the given information to find the number of degrees of​ freedom, the critical values chi...

Use the given information to find the number of degrees of​ freedom, the critical values chi Subscript Upper L Superscript 2 and chi Subscript Upper R Superscript 2​, and the confidence interval estimate of sigma. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution. Nicotine in menthol cigarettes 80​% ​confidence; n=27​, s=0.29 mg.

Solutions

Expert Solution

Solution :

Given that,

s = 0.29

s2 = 0.0841

2L = 2/2,df = 35.563

2R = 21 - /2,df = 17.292

The 80% confidence interval for is,

(n - 1)s2 / 2/2 < < (n - 1)s2 / 21 - /2

  26 * 0.0841 / 35.563 < < 26 * 0.0841 / 17.292

0.25 < < 0.36

(0.25 , 0.36)


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