The manager of a toy company wants to find out how many defective toys are produced by his company each year. As a sample for the survey, he plans to examine the first 100 toys made on a Monday morning.
Why might this group of toys not be a valid sample?
A) the sample should be all the toys produced
B) the sample should represent all the toys produced throughout the day, not just the first 100
C) the sample should only be 10 toys
D) the sample should represent an entire week or month, not just a single day
E) the manager cannot tell if a toy is defective