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Listed below are the percent tips given when a restaurant bill contains a bad weather report...

Listed below are the percent tips given when a restaurant bill contains a bad weather report on the back. At a level of alpha = 0.01, determine whether the mean percentage tip will be less than 20 percent. Assume that sigma = 2. State hypotheses and conclusion.

                        18.0   19.1   19.2   18.8   18.4 19.0 18.5 16.1 16.8 18.2

                        14.0   17.0   13.6   17.5   20.0   20.2   18.8   18.0   23.2   19.4

I need help finding the P-value. Thanks!

Math   Statistics-And-Probability   
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