Algebra 2 question

Question

A CEO wants to know the preference of employees regarding a rule that modifies the time allotted for lunch. If there are 400 employees, which of the following is a valid sample for the CEO to use for this purpose?

Answer 1

1. Randomly selected employees (to avoid bias)
2. Representative of the population (mix of departments, shifts, roles)
3. Sufficient size( 10 -20 % of Population

Example: A random sample of 50 - 80 employees.