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39 is what needs answerd please use calculator method and include p-values

39 is what needs answerd please use calculator method and include p-values

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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21.39 is what needs answerd please use calculator method and include p-values

21.37 Improving your tips. Researchers gave 40 index cards to a waitress at an Italian restaurant in New Jersey. Before delivering the bill to each customer, the waitress ran- domly selected a card and wrote on the bill the same message that was printed on the index card. Twenty of the cards had the message, "The weather is supposed to be really good tomorrow. I hope you enjoy the day!" An- other 20 cards contained the message, "The weather is supposed to be not so good tomorrow. I hope you enjoy the day anyway!" After the customers left, the waitress recorded the amount of the tip (percent of bill) before taxes. Here are the tips for those receiving the good- weather message:20 m TIP4 20.8 18.7 19.9 20.6 21.9 23.4 22.8 24.9 22.2 20.3 24.9 22.3 27.0 20.5 22.2 24.0 21.2 22.1 22.0 22.7 The tips for the 20 customers who received the bad weather message are 18.0 19.1 19.2 18.8 18.4 19.0 18.5 16.1 16.8 14.0 17.0 13.6 17.5 20.0 20.2 18.8 18.0 23.2 18.2 19.4
Transcribed Image Text:21.37 Improving your tips. Researchers gave 40 index cards to a waitress at an Italian restaurant in New Jersey. Before delivering the bill to each customer, the waitress ran- domly selected a card and wrote on the bill the same message that was printed on the index card. Twenty of the cards had the message, "The weather is supposed to be really good tomorrow. I hope you enjoy the day!" An- other 20 cards contained the message, "The weather is supposed to be not so good tomorrow. I hope you enjoy the day anyway!" After the customers left, the waitress recorded the amount of the tip (percent of bill) before taxes. Here are the tips for those receiving the good- weather message:20 m TIP4 20.8 18.7 19.9 20.6 21.9 23.4 22.8 24.9 22.2 20.3 24.9 22.3 27.0 20.5 22.2 24.0 21.2 22.1 22.0 22.7 The tips for the 20 customers who received the bad weather message are 18.0 19.1 19.2 18.8 18.4 19.0 18.5 16.1 16.8 14.0 17.0 13.6 17.5 20.0 20.2 18.8 18.0 23.2 18.2 19.4
customers stay in the restaurant? State hypotheses, report your conclusions. 39 Improving your tips, continued. Use the data in Exer- cise 21.37 to give a 95% confidence interval for the difference between the mean percent tips for the two carry out at test, and 2. 4. 4. different messages. l TIP4
Transcribed Image Text:customers stay in the restaurant? State hypotheses, report your conclusions. 39 Improving your tips, continued. Use the data in Exer- cise 21.37 to give a 95% confidence interval for the difference between the mean percent tips for the two carry out at test, and 2. 4. 4. different messages. l TIP4
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