Recently, a university surveyed recent graduates of the English Department for their starting salaries. Four hundred graduates returned the survey. The average salary was $25,000. The population standard deviation is known to be $2,500. Interpret the results of the 95% confidence interval.
A) The population mean is in the interval.
B) The population mean is not in the interval.
C) The likelihood that any confidence interval based on a sample of 400 graduates will contain the population mean is 0.95.
D) There is a 95% chance that the computed interval does not contain the population mean.

Question

Quizplus · Accepted Answer

The 95% confidence interval means that if we were to take many samples and compute a confidence interval for each, 95% of those intervals would contain the true population mean.

Recently, a University Surveyed Recent Graduates of the English Department