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Why the new consistency table is
Sat. Before. Unsat.before
Sat.after. 70. 10
Uns.after. 2. 18
A hundred people were asked whether the service provided by the fire department in the city was satisfactory. Shortly after the survey, a large fire occured in the city. Suppose that the same 100 people were asked whether they thought that the service provided by the fire department was satisfactory. The result are in the following table: Satisfactory Before fire After fire 80 72 20 28 At the level a-5%, test whether or not the opinions changed after the fire. (Hint: make a new contingency table)
math   Statistics-And-Probability   
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loo 100 6 2 8 aftes tre ive need f ahe a nee Ctee aA18 ·午 2 go one 九女 lo → 22.40 57

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