What information does a confidence interval give?
A sample of 50 employees was taken and the average number of children in each of the employee's family was computed to be 2.1 with a standard deviation of 0.5.
Compute the 95% confidence interval on the average number of children. Interpret the answer .
Here n = 50, Mean x ̅ = 2.1, Standard Deviation σ = 0.50
= 0.05, so ...
The solution examines confidence interval information. A 95% confidence interval on average is used.