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A combination of terms and mathematical operations that contains at least one variable.



then find y and plug that y value into one of the original equations to find x
Hope this helps!
Answer: 
Step-by-step explanation:
Given : sample size : n= 51
sample standard deviation : s= 0.46
Significance level : 
Using chi-square distribution, the critical values will be :


Confidence interval for population standard deviation (
) :

Substitute all the values , we get

Hence, the 95% two-sided confidence interval for σ : 