Answer:
The correect answers are
85.19, 91.55
Step-by-step explanation:
The upper bound is given by
μ +z₀.₀₅×[tex]\frac{\sigma}{\sqrt{n} }[/tex] = 88.37 +1.96×18.88/√(135) = 91.55
The lower bound is given by
μ -z₀.₀₅×[tex]\frac{\sigma}{\sqrt{n} }[/tex] = 88.37 -1.96×18.88/√(135) = 85.19
Therefore the upper and lower bound confidence interval containing 95 % of the sample mean are
85.19 , 91.55
