The director of the Birkfield, California, Women’s Shelter is planning the budget for next year and wants to know whether it’s reasonable to assume an average stay of 21 days per client. The director asks her assistant to take a random sample of 35 clients who recently stayed at either of the shelter’s two locations. The sample shows an average stay of 23 days with a standard deviation of 9.3 days. What should the assistant tell the director?