Hi all,
I was hoping someone could clarify a question I am stuck on.
The 95% confidence interval of the sample mean of employee age for a major corporation is 19 years to 44 years based on a a z-statistic. The population of employees is more than 5,000 and the sample size of this test is 100. Assuming the population is normally distributed, the standard error of mean employee age is closest to:
A. 1.96
B. 2.58
C. 6.38
The answers is C, 6.38 - but I have trouble understanding why.
Any insights would be hugely appreciated.
Jim