Question
In: Statistics and Probability
21.39) Researchers gave 20 index cards to a waitress at an Italian restaurant in New Jersey....
21.39) Researchers gave 20 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. 20 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:
| 20.6 | 18.4 | 20.1 | 20.8 | 22.1 | 23.7 | 22.7 | 25 | 22.4 | 20.5 |
| 25.1 | 22.3 | 27 | 20.8 | 22.2 | 23.9 | 21.1 | 21.9 | 21.8 | 22.9 |
The tips for the 20 customers who received the bad- weather message are
| 17.9 | 19.2 | 19.4 | 18.7 | 18.7 | 18.7 | 18.2 | 16.3 | 16.6 | 14 |
| 16.8 | 13.8 | 17.7 | 20 | 20.2 | 18.8 | 17.9 | 23.3 | 18.3 | 19.2 |
Give a 90 % confidence interval for the difference between the mean percent tips for the two different messages.
Use the conservative approach (Option 2), where df=20-1 or 19.
Do not use software to calculate the interval.
The confidence interval (±±0.01) is from to
Solutions
orchestra answered 2 years agoRelated Solutions
Researchers gave 40 index cards to a waitress at an Italian restaurant in New Jersey. Before...
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...
Researchers gave 40 index cards to a waitress at an Italian restaurant in New Jersey. Before...
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...
Dominick Aldo owns and operates Carolina’s which is an Italian restaurant in New York. The file...
Dominick Aldo owns and operates Carolina’s which is an Italian
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You are planning to buy a house in New Jersey. You put a 20% down payment,...
You are planning to buy a house in New Jersey. You put a 20%
down payment, and 15-year mortgage rates are at 4.2% -Price of the
house is $400,000.
A. Calculate the 1st month interest payments
B.Calculate the 1st month principal payments
C. Calculate the monthly payments.
Place answer in the box below and use 2 decimals and no $
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Dominick Aldo owns and operates Carolina’s which is an Italian restaurant in New York. The file Single Population.xlsx is shown below and contains the amount of time that table times varied from table to table.
Dominick Aldo owns and operates Carolina’s which is an Italian restaurant in New York. The file Single Population.xlsx is shown below and contains the amount of time that table times varied from table to table. A) Test the hypothesis that the average table time exceeds 98 minutes using 0.05 ? = . B) What is the p-value? Interpret the results. Be sure that your project shows the following steps 1. Null and alternative hypothesis 2. Determine which distribution to use...
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