The question below refers to the following situation:
A valet parking attendant is interested in whether daytime temperature affects the size of tips. To study this question, she records the size of the tip given by her customers on 3 extremely hot summer days, 3 warm spring days, and 3 cold winter days. Complete an analysis of variance to test the differences between mean tips with significance (α = .05), to determine if the groups differ from each other. 
What is the null hypothesis?
Definitions:
Ethnocentrism
The belief in the superiority of one's own ethnic group or culture, often accompanied by a devaluation of other cultures.
Communication Style
The characteristic way in which an individual or organization expresses ideas and exchanges information with others.
Culture
The arts, beliefs, and customs that are passed down from generation to generation within a society.
Stereotyping
The act of assigning generalized attributes to individuals based on their membership in a particular group, without acknowledging individual differences.
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