As part of a statistics project, Charlie would like to collect data on household size in his city. To do so, he asks each person in his statistics class for the size of their household and reports the results of a simple random sample. However, this is not a simple random sample. Why

The reason is Charlie chooses the sample which does not requires hard work to extract useful data and other factors were not considered like babies are always part of household size.

Explanation:

The approach was to just completing the task not completing the task with the level of research which it requires. The sample chosen was very small and was not representative of the population. The reason is that the students in the stats class might be from same housing society where millionaires reside. So the sample is inappropriate here because the way a rich people spend his life is different from the labors, etc. So the household matters on the financial status of person, culture, etc. The sample chosen a very small share which was not a random selection.

Secondly, Charlie must consider the age of person that the person is financially responsible to take care of. Because babies are always in the household size and that this information was also not considered necessary by Charlie to extract.