One of your job tasks is to monitor deliveries of fresh produce to the stores. You decided to find out the average number of times the deliveries are delayed.

Which one is the true statement?

A.In order to satisfy the management,you need to select the best delivery times and find their average.

B.If a simple random sample is selected, the average number of delayed deliveries in the sample will not be exactly equal to the average number of delayed deliveries overall.

C.You should study only those deliveries which the management identifies as the most delayed.

D.Because of the sampling error,you must never select a random sample.Instead,you must study the whole population.