Problem:

Do you turn off the light when you leave the room? South Korean researchers wondered how they could increase the number of people who do by use of posters (Ahn, Kim, & Aggarwal, 2013). In one, an image of a light bulb was anthropomorphized by giving it eyes, nose, and a mouth, as well as adding the words, "I'm burning hot, turn me off when you leave!". In a second, there were no human features on the light bulb and the text simply said, "Our bulbs are burning hot, turn the lights off when you leave!".

They compared how people would respond to the two posters by having each displayed in separate coffee rooms for two weeks. Although the coffee rooms were different, they were matched as closely as possible on as many parameters as possible (similar business, # of employees, et cet) such that this is a correlated groups design. Percent likelihood of someone turning off the light upon exiting was calculated every day and is presented below.

Anthropomorphism Nonanthropomorphism

87.2 76.3

78.1 86.2

77.5 76.5

91.9 87.0

86.6 77.6

87.4 86.8

76.5 76.2

65.7 65.2

88.3 55.4

57.5 51.7

68.6 61.8

67.9 53.7

73.5 62.9

77.7 57.6

Completed a one way Anova with a box plot:

Sum of

Squares df Mean Square F Sig

Between Groups 6.500 26 .250 .500 .831

Within Groups .500 1 .500

Total 7.000 27

I need to know the Effect Size