Ecolabels such as Energy Star, Green Key, and Audubon International are used by hotels to advertise their energy-saving and conservation policies. To investigate how familiar travelers are with these ecolabels and whether travelers believe they are credible, a sample of 392 adult travelers was administered a questionnaire. One question showed a list of 5 different ecolabels and asked "How familiar are you with this ecolabel, on a scale of 1 (not familiar at all) to 5 (very familiar)". Results of the survey were shown in the table below. Which Ecolabel has the largest variation in travelers' response of familiarity? ECOLABEL Energy Star Green Key Audubon International Green Business Bureau TripAdvisor Greenleaders O Green Business Bureau O Audubon International O Green Key Energy Star Mean 4.44 2.01 2.41 2.25 3.57 Standard Deviation 0.82 1.30 1.44 1.39 1.38

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