To apply the two-sample t procedures, use Option 1 if you have technology that implements that method. Otherwise, use Option 2. Researchers gave 40 index cards to a waitress at an Italian restaurant in New Jersey. Before delivering the bill to each customer, the waitress randomly 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!" Another 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. 21.0 18.8 20.3 20.9 21.9 23.7 22.8 25.2 22.7 20.8 25.1 22.3 27.3 21.0 22.5 24.2 21.3 22.3 22.0 23.2 The tips for the 20 customers who received the bad-weather message are below. 19.3 18.8 16.1 17.1 14.4 18.0 19.1 19.4 19.2 18.9 17.1 13.6 17.8 20.4 20.6 19.0 18.2 23.2 18.4 19.5 Give a 95% confidence interval for the difference between the mean percent tips for the two different messages. (Round your answers to two decimal places.) x to X percent
To apply the two-sample t procedures, use Option 1 if you have technology that implements that method. Otherwise, use Option 2. Researchers gave 40 index cards to a waitress at an Italian restaurant in New Jersey. Before delivering the bill to each customer, the waitress randomly 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!" Another 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. 21.0 18.8 20.3 20.9 21.9 23.7 22.8 25.2 22.7 20.8 25.1 22.3 27.3 21.0 22.5 24.2 21.3 22.3 22.0 23.2 The tips for the 20 customers who received the bad-weather message are below. 19.3 18.8 16.1 17.1 14.4 18.0 19.1 19.4 19.2 18.9 17.1 13.6 17.8 20.4 20.6 19.0 18.2 23.2 18.4 19.5 Give a 95% confidence interval for the difference between the mean percent tips for the two different messages. (Round your answers to two decimal places.) x to X percent
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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Transcribed Image Text:To apply the two-sample t procedures, use Option 1 if you have technology that implements that method. Otherwise, use Option 2.
Researchers gave 40 index cards to a waitress at an Italian restaurant in New Jersey. Before delivering the bill to each customer, the waitress randomly 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!" Another 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.
21.0 18.8 20.3 20.9 21.9 23.7 22.8 25.2 22.7 20.8
25.1 22.3 27.3 21.0 22.5 24.2 21.3 22.3 22.0 23.2
The tips for the 20 customers who received the bad-weather message are below.
19.3 18.8 16.1 17.1 14.4
18.0 19.1 19.4 19.2 18.9
17.1 13.6 17.8 20.4 20.6
19.0 18.2 23.2 18.4 19.5
Give a 95% confidence interval for the difference between the mean percent tips for the two different messages. (Round your answers to two decimal places.)
x to
X percent
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