18 (3.24) (a) give an example of a way to choose a sample of students that is poor practice because it depends on voluntary response. ask your friends to participate in the study. hang a sign that asks people to call a number to participate in a study about parking on campus. all the answers are correct.

All the answers are correct.

In order for a study to produce results that are significant for the population, the sample needs to be representative. One of the most important factors in making that sample representative is electing subjects in a random manner.

If the subjects are chosen from a group of friends or as volunteers, it is likely that sample will share common characteristics in higher numbers than the ones found in the population. Therefore, the final results could be biased.

explanation:

with the profits from the european sales, merchants purchased europe's manufactured  goods, including tools and weapons. then the merchants shipped those manufactured  goods, along with the  american  sugar and rum, to west africa where they were bartered for  slaves.

answer; the answer to the first question is (king james ii was replaced by his daughter mary and her dutch husband william of orange;