An Assembly Line Is Operating Satisfactorily If Fewer Than 3

An assembly line is operating satisfactorily if fewer than 3% of the phones produced per day are defective. To check the quality of a dayʹs production, the company randomly samples 10 phones
From a dayʹs production to test for defects. Define the population of interest to the manufacturer.

A) the 10 phones sampled and tested
B) the 10 responses: defective or not defective
C) the 3% of the phones that are defective
D) all the phones produced during the day in question