39. Product testing. A company is producing and marketing new reading activities for elementary school children that it believes will improve reading comprehension scores.

A researcher randomly assigns third graders to an eightweek program in which some will use these activities and others will experience traditional teaching methods. At the end of the experiment, both groups take a reading comprehension exam. Their scores are shown in the back-to-back stem-and-leaf display. Do these results suggest that the new activities are better? Test an appropriate hypothesis and state your conclusion.

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