In: Statistics and Probability
1) A simple random sample of four employees of AIG (which has 20,000 employees in all) provided the following information on how long they have been working with the firm.
Employee: |
Joe |
Bryn |
Paige |
Tristan |
Years with firm: |
20 |
35 |
20 |
25 |
(Assume that “years with firm” for the 20,000 AIG employees is normally distributed).
What are the degrees of freedom (df) for this problem?
Calculate a point estimate of the average (mean) number of years with the firm of all AIG’s employees.
Calculate the sample standard deviation of years with the firm of the 4 employees sampled
Find the margin of error for a 95% confidence level.