A Hospital Emergency Room Has Collected a Sample of N

Multiple Choice

A hospital emergency room has collected a sample of n = 40 to estimate the mean number of visits per day. It has found the standard deviation is 32. Using a 90 percent confidence level, what is its margin of error?

A) Approximately ±1.5 visits
B) About ±9.9 visits
C) Approximately ±8.3 visits
D) About ±1.3 visits