An accountant works in a company that has 2,000 employees, and he wants to determine the employees’

savings for retirement based on the different categories of age. He groups the employees into four age groups:

less than 30 years old, 30 to less than 40 years old, 40 to less than 50 years old, 50 years old and more. Then he identifies the number of employees who belong to each of these age groups and selects a sample of 100 employees.

a) Do you think the accountant was using an SRS? Why?

b) What kind of sampling design do you think he used?