a manager wants to know if the mean productivity of two workers is the same. for a random selection of 30 hours in the past month, he compares the number of items produced by each worker in that hour. a. the data should be treated as paired samples. each pair consists of an hour in which the productivity of the two workers is compared. b. the data should be treated as paired samples. each pair consists of two hours in which the number of items produced is compared. c. the data should be treated as independent samples because the samples are random.