A cable company has developed a pilot training program for its sales representatives designed to increase upselling getting the customer to buy more expensive bundles of cable, internet, and phone service. The company evaluated the impact of the training by measuring participants knowledge of the new selling techniques using a multiple-choice test. The company tracked the sales representatives' sales before and after the training, and their results are reported below.

1. Was the training effective? Use the information in the two graphs below to justify your answer.
2. Explain one reason why you might distrust the results (That is, is it possible that the results dont mean what they appear to mean?).

	pre-training	post-training
Knowledge test pass rate	55%	75%
Average weekly sales	$1,000	$1,500
Average number of upsales per week	5	6

Note: "Upsale" is the practice of convincing a customer to buy a higher-end product