Let a 95% confidence interval states that population mean is greater than 250 and less than 550. The sample mean and margin of error for the given data is:
Answer & explanation
Correct answer: option 2
$\text{95\% confidence interval }=(250,550).$
$\text{Sample mean }=\frac{250+550}{2}=400.$
$\text{Margin of error }=\frac{550-250}{2}=150.$
$\text{Sample mean }=400,\;\text{Margin of error }=150.$