In a large lecture class, a professor decides to make his class notes available on the Internet. During one of his lectures, he mentions that he would like some feedback concerning the usefulness of these notes. He asks students to leave written comments in his mailbox regarding the usefulness of having the class notes available on the Internet. He gets written comments from twenty-three students, and, in their written comments, most indicate that having the notes readily available helped them in the course. This is an example of

a voluntary response sample.

Explanation:

A voluntary response sample is described as a type of sample made up for participants to give their review on a subject matter. The purpose of a voluntary response sample is for the researcher to see the reviews of the people he or she is sharing the information with. This is the scenario between the professor and his students, he wants to know their view as regards him posting the notes online for them.

according to hess's theory, when the magma cooled, it would expand and push the tectonic plates apart. it would push the north and south america plates to the west and eurasia and africa ones to the east. the atlantic ocean would get wider but the coastlines of the masses would stay the same.

harry hammond hess was a geologist and a united states navy officer in the second world war. he is considered to be one of the founding fathers of the theory of plate tectonics. he is known for his theories on sea floor spreading, stating that the movement of the continents was the result of see floor spreading. the continents are attached to the plates and do not move separately. the plates themselves shift and change shape, carrying the continents along.

it teaches readers about an interesting chinese custom and causes them to determine that the minister is trying to be polite