A researcher randomly assigns 33 subjects to one of three groups. Group 1 receives technical dietary information interactively from an online website. Group 2 receives the same information from a nurse practitioner, while Group 3 receives the information from a video made by the same nurse practitioner.

The researcher looked at three different ratings of the presentation: difficulty, usefulness, and importance to determine if there is a difference in the modes of presentation. In particular, the researcher is interested in whether the interactive website is superior because that is the most cost-effective way of delivering the information.

Group Usefulness Difficulty Importance 1 20 5 18 1 25 9 8 23 15 20 16 9 22 20 6 22 1 28 14 8 20 6 13 25 8 13 24 10 24 18 10 20 17 9 4Group Usefulness Difficulty Importance 2 28 7 14 2 25 14 5 2 26 9 20 2 19 15 22 2 29 14 12 2 15 6 2 2 29 10 5 2 26 11 1 2 22 5 2 2 15 15 14 2 29 6 4 2 15 6 3Group Usefulness Difficulty Importance 3 22 8 12 3 27 9 14 3 21 10 7 3 17 9 1 3 16 7 12 3 19 9 7 3 23 10 W 27 9 5 3 23 9 6 W 16 14 22