A lube and oil change business believes that the number of cars that arrive for service is the same each day of the week. If the business is open six days a week (Monday - Saturday) and a random sample of n = 200 customers is selected, the sum of the expected frequencies over the six days cannot be determined without seeing the actual sample data.

Question

Quizplus · Accepted Answer

The sum of the expected frequencies over the six days can be determined because if the business believes the number of cars that arrive for service is the same each day, then the expected frequency for each day is the total sample size divided by the number of days open (200/6). The sum of the expected frequencies over the six days would simply be the total sample size, n = 200, regardless of the actual sample data.

A Lube and Oil Change Business Believes That the Number