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2. People tend to be more generous after receiving good news. Does their generosity change after receiving bad news? The average tip left by adult
2. People tend to be more generous after receiving good news. Does their generosity change after receiving bad news? The average tip left by adult Americans is 16.5%. 25 patrons of a restaurant were randomly selected to be given a message on their bill warning them that the following day's weather would be bad. Their tip percentages were recorded. The mean tip as a percentage of the total bill was 15.62 with a standard deviation of 2. Is there enough evidence that the mean tip percentage for all patrons of this restaurant changed from 16.5% when they receive a message warning them that tomorrow's weather will be bad? Assume tipping percentage is normally distributed in the population. Use a t-critical of 2.06. (8 pts) a. Write the null and alternate hypothesis for this test. b. Calculate the test statistic for this test. Show all your work. c. Write a complete answer detailing the results, including any necessary statistics
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