If the sample mean is 56.2, with an upper limit to the confidence interval of 62.74, what is the lower limit?
A) 6.54
B) 49.66
C) 52.46
D) 56.20

Question

Quizplus · Accepted Answer

To find the lower limit, we need to subtract the margin of error from the sample mean. The margin of error is the difference between the upper and lower limits of the confidence interval, divided by 2. 
So, margin of error = (upper limit - sample mean) / 2 = (62.74 - 56.2) / 2 = 3.27
Therefore, the lower limit = sample mean - margin of error = 56.2 - 3.27 = 52.46
Hence, the answer is B.

If the Sample Mean Is 56