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In: Statistics and Probability

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 90​% ​confidence; nequals23​, sequals0.25 mg.

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Expert Solution

We have given here,                                  
                                  
                      
Sample standard deviation=0.25                      
Sample size =23                          
                                  
Degree of freedom =n-1=   22                      
Level of significance given =1-0.90=0.1                      
Chi square critical value for lower tail=12.338                  
                                  
Chi square critical value for upper tail=33.924                  


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