Sample average is . a) unselected the upper and lower limits of a control chart b) unselected a key measure that represents the central tendency of a group of samples used in conjunction with range (R) c) unselected a measure that refers to the presence or absence of a particular characteristic d) unselected a key measure that represents the variation of a specific sample group, used in conjunction with sample average (X) e) unselected

The correct answer is D) The unselected a key measure that represents the variation of a specific sample group, used in conjunction with sample average (X).

b. a single paragraph.

a paragraph is a series of sentences that are organized and make sense, and are all related to a single topic . almost every piece of writing you do that is longer than a few sentences should be organized into paragraphs. this is because paragraphs show a reader where the subdivisions of an essay begin and end, and thus the reader see the organization of the essay into subjects in order to be able to understand its main points.

i think the answer to your question is b. directive