If our research objective is to summarize the data in the sample, we should use percentages if the variable has a categorical scale

A moral rule of commercial work is to

A. compete. B. be open to inventiveness and novelty. C. be efficient. D. All of these are correct.

The closed shop appears in what percent of today's labor agreements?

a. more than 97 c. about 50 b. less than 5 d. about 72