Use the given information to find the number of degrees of​ freedom, the critical values χ2L and χ2R​, and the confidence interval estimate of σ. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution.   Platelet Counts of Women 98​% confidence; n=22​, s=65.9.   1. df=   2. x2L=   3. x2R=   4. The confidence interval for σ is

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Use the given information to find the number of degrees of​ freedom, the critical values χ2L and χ2R​, and the confidence interval estimate of σ. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution.
 
Platelet Counts of Women 98​% confidence; n=22​, s=65.9.
 
1. df=
 
2. x2L=
 
3. x2R=
 
4. The confidence interval for σ is
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