On Saturdays, Cars Arrive at David Zebda's Scrub and Shine

Multiple Choice

On Saturdays, cars arrive at David Zebda's Scrub and Shine Car Wash at the rate of 80 cars per hour during the ten-hour shift.David wants a sample of 40 Saturday customers to answer the long version of his quality service questionnaire.He instructs the Saturday crew to select the first 40 customers.His sample is a __________.

A) convenience sample
B) simple random sample
C) systematic sample
D) stratified sample
E) cluster sample