Homework Help is Here – Start Your Trial Now!
Math
Statistics
1. Past data suggests that the average wait time at the drive-through at a certain fast food restaurant is 94 seconds, with a standard deviation of 21 seconds. The manager devises a new system that he thinks will improve the wait time. He times the next 25 cars and finds that the average of this sample is 89 seconds. a) Is there enough reason to believe that the new system has succeeded in lowering the wait time, to a 5% level of significance? b) Spoiler alert: the answer to (a) is “no." In other words, we fail to reject the null hypothesis. But does this prove definitively that the manager's new system doesn't work? Explain briefly. c) If the manager still has confidence in his new system, what should he do to prove its effectiveness?

1. Past data suggests that the average wait time at the drive-through at a certain fast food restaurant is 94 seconds, with a standard deviation of 21 seconds. The manager devises a new system that he thinks will improve the wait time. He times the next 25 cars and finds that the average of this sample is 89 seconds. a) Is there enough reason to believe that the new system has succeeded in lowering the wait time, to a 5% level of significance? b) Spoiler alert: the answer to (a) is “no." In other words, we fail to reject the null hypothesis. But does this prove definitively that the manager's new system doesn't work? Explain briefly. c) If the manager still has confidence in his new system, what should he do to prove its effectiveness?

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
See similar textbooks
icon
Related questions
Question
Hello can you please answer 1A, 1B and 1C thank you
Name Worksheet #12 – Hypothesis Testing continued (10.2-10.4) To complete this worksheet, you will need to refer to both the normal (z) chart and Student's t chart, found at the end of the class notes for sections 10.2 and 10.3 respectively. 1. Past data suggests that the average wait time at the drive-through at a certain fast food restaurant is 94 seconds, with a standard deviation of 21 seconds. The manager devises a new system that he thinks will improve the wait time. He times the next 25 cars and finds that the average of this sample is 89 seconds. a) Is there enough reason to believe that the new system has succeeded in lowering the wait time, to a 5% level of significance? b) Spoiler alert: the answer to (a) is “no." In other words, we fail to reject the null hypothesis. But does this prove definitively that the manager's new system doesn't work? Explain briefly. c) If the manager still has confidence in his new system, what should he do to prove its effectiveness? 2. A pharmaceutical company claims that their pill relieves heartburn in over 90% of the people who take it. In clinical trials, the pill relieved the heartburn of 213 out of the 224 patients who tried it. Test the company's claim that over 90% of people felt relief, to a 1% level of significance.
Transcribed Image Text:Name Worksheet #12 – Hypothesis Testing continued (10.2-10.4) To complete this worksheet, you will need to refer to both the normal (z) chart and Student's t chart, found at the end of the class notes for sections 10.2 and 10.3 respectively. 1. Past data suggests that the average wait time at the drive-through at a certain fast food restaurant is 94 seconds, with a standard deviation of 21 seconds. The manager devises a new system that he thinks will improve the wait time. He times the next 25 cars and finds that the average of this sample is 89 seconds. a) Is there enough reason to believe that the new system has succeeded in lowering the wait time, to a 5% level of significance? b) Spoiler alert: the answer to (a) is “no." In other words, we fail to reject the null hypothesis. But does this prove definitively that the manager's new system doesn't work? Explain briefly. c) If the manager still has confidence in his new system, what should he do to prove its effectiveness? 2. A pharmaceutical company claims that their pill relieves heartburn in over 90% of the people who take it. In clinical trials, the pill relieved the heartburn of 213 out of the 224 patients who tried it. Test the company's claim that over 90% of people felt relief, to a 1% level of significance.
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps with 1 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Recommended textbooks for you
MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
Statistics
ISBN:
9781119256830
Author:
Amos Gilat
Publisher:
John Wiley & Sons Inc
Probability and Statistics for Engineering and th…
Probability and Statistics for Engineering and th…
Statistics
ISBN:
9781305251809
Author:
Jay L. Devore
Publisher:
Cengage Learning
Statistics for The Behavioral Sciences (MindTap C…
Statistics for The Behavioral Sciences (MindTap C…
Statistics
ISBN:
9781305504912
Author:
Frederick J Gravetter, Larry B. Wallnau
Publisher:
Cengage Learning
Elementary Statistics: Picturing the World (7th E…
Elementary Statistics: Picturing the World (7th E…
Statistics
ISBN:
9780134683416
Author:
Ron Larson, Betsy Farber
Publisher:
PEARSON
The Basic Practice of Statistics
The Basic Practice of Statistics
Statistics
ISBN:
9781319042578
Author:
David S. Moore, William I. Notz, Michael A. Fligner
Publisher:
W. H. Freeman
Introduction to the Practice of Statistics
Introduction to the Practice of Statistics
Statistics
ISBN:
9781319013387
Author:
David S. Moore, George P. McCabe, Bruce A. Craig
Publisher:
W. H. Freeman
SEE MORE TEXTBOOKS