Which of the following are reasons that a sampling technique may not be scientific. Choose all that apply.

a.) Trying to conclude that there is a cause-and-effect relationship when something else causes both

b.)People who were asked refused to answer

c.)The graphs are drawn in a way to mislead the reader

d.)Two factors cannot be separated to determine which is the one that is responsible for the outcome

e.)The researcher was not able to survey every individual from the population

f.)The funders of the project are partial to the results