Essay
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?
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