1) Dr Tips was interested in determining whether a waitress' message on a customer's restaurant bill (thank you, a smiley face, or no message) and the waitress' natural eye color (brown or green) would affect the size of her tip (measured as the mean percentage of the overall bill). A total of 120 customers were involved in the study and 20 were randomly assigned to each of the following conditions. The mean percentage tip for each condition is also provided below. waitress eye color message type mean % tip brown no message (NM) 12 brown smiley face (SF) 16 brown thank you (TY) 20 green no message (NM) 10 green smiley face (SF) 12 green thank you (TY) 14

1C) List each significant effect and after each one, describe what the effect is telling us about how the variables affected tips. (For the purpose of this exercise, assume that a difference of "2" between any of the row or column means is a significant difference. Also, if the data or graph seems to indicate an interaction effect, consider it as being a significant interaction.)