If the sample standard deviation is 10.5 and the sample mean is 48 based on a study with a sample size of 120,the 95 percent confidence interval about the mean is between approximately:
A)44.37 and 51.63
B)46.12 and 49.88
C)47.88 and 48.12
D)40.0 and 50.0

Question

Quizplus · Accepted Answer

The 95% confidence interval is calculated using the formula: mean ± (Z * (standard deviation/√n)). Here, Z is approximately 1.96 for 95% confidence.

If the Sample Standard Deviation Is 10