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standard-deviation-pop-q39536837)
Step 1 of 3
We have given that
Sample size n =40
Population standard deviation =12
Step 2 of 3
Solution:-
The mean of a set of numbers is the sum divided by the number of terms.
Simplify the numerator.
Cancel the common factor of and .
Divide.
Step 3 of 3
The critical value for α=0.05 is Zc=1.96
(Calculated Using R)
1 qnorm(0.05/2,lower.tail=F)
2 [1] 1.959964
The 95% confidence interval is.
Final Answer
The 95% confidence interval is.
(90.78 , 98.22)