Central Middle School has calculated a 95% confidence interval for the mean height ($\mu$)of 11-year-old boys at their school and found it to be 56 ± 2 inches.Which of the following could be the 90% confidence interval based on the same data?
A)56 ± 1
B)56 ± 2
C)56 ± 3
D)Without knowing the sample size,any of the above answers could be the 90% confidence interval.

Question

Quizplus · Accepted Answer

A 90% confidence interval is narrower than a 95% confidence interval because it reflects a lower level of confidence, meaning it requires a smaller margin of error around the mean.

Central Middle School Has Calculated a 95% Confidence Interval for the Mean