THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
Suppose that the waiting times for patients at a local hospital are normally distributed with known population standard deviation of 30 minutes.A random sample of 75 patients in the local hospital had a mean time of 90 minutes.Assume a 95% confidence interval for the population mean μ.
-Calculate the standard error of the 95% confidence interval.
A)0.40
B)3.46
C)13.69
D)2.50

Question

Quizplus · Accepted Answer

The standard error (SE) of the mean is calculated using the formula SE = σ / √n, where σ is the population standard deviation and n is the sample size. Given σ = 30 minutes and n = 75, SE = 30 / √75 = 3.46.