To estimate ,the mean salary of full professors at American colleges and universities,you obtain the salaries of a random sample of 400 full professors.The sample mean is $73,220 and the sample standard deviation is $4400.What is a 99% confidence interval for the mean ?

A) 73,220 ± 28
B) 73,220 ± 433
C) 73,220 ± 569
D) 73,220 ± 4400

Confidence Interval

A spectrum of numbers, extracted from sample observations, presumed to hold the value of a not yet identified population characteristic.

Sample Mean

The average value of a set of data points taken from a larger population, used as an estimate of the population mean.

Sample Standard Deviation

A measure of the amount of variation or dispersion of a set of values in a sample.