Homework Help is Here – Start Your Trial Now!
Math
Statistics
2. Ramsey County’s 911 call center once published data on several years of phone calls (more than 800,000) for which 6% of the calls took more than 30 seconds to be answered. This seemed clearly unacceptable (imagine calling 911 in an emergency and waiting more than 30 seconds for an answer!) so steps were taken to reduce the time for an operator to answer. In the first month after the changes, there were 16,357 calls to the center, and in 932 of these calls the operator took more than 30 seconds to answer. Assume this first month of calls can be considered a random sample of calls. State the null hypothesis, Ho, and the alternative hypothesis, HA, that should be used to determine if the changes have reduced the percent of calls that are answered in more than 30 seconds. Ho: English version:

2. Ramsey County’s 911 call center once published data on several years of phone calls (more than 800,000) for which 6% of the calls took more than 30 seconds to be answered. This seemed clearly unacceptable (imagine calling 911 in an emergency and waiting more than 30 seconds for an answer!) so steps were taken to reduce the time for an operator to answer. In the first month after the changes, there were 16,357 calls to the center, and in 932 of these calls the operator took more than 30 seconds to answer. Assume this first month of calls can be considered a random sample of calls. State the null hypothesis, Ho, and the alternative hypothesis, HA, that should be used to determine if the changes have reduced the percent of calls that are answered in more than 30 seconds. Ho: English version:

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
100%

I was cofused these questions specifically the symbolic versions. And the rest of the questions were hard to understand.

2. Ramsey County's 911 call center once published data on several years of phone calls (more than 800,000) for which 6% of the calls took more than 30 seconds to be answered. This seemed clearly unacceptable (imagine calling 911 in an emergency and waiting more than 30 seconds for an answer!) so steps were taken to reduce the time for an operator to answer. In the first month after the changes, there were 16,357 calls to the center, and in 932 of these calls the operator took more than 30 seconds to answer. Assume this first month of calls can be considered a random sample of calls. a. State the null hypothesis, Ho, and the alternative hypothesis, HA, that should be used to determine if the changes have reduced the percent of calls that are answered in more than 30 seconds. Ho: English version: Symbolic version: HA: English version: Symbolic version: b. Check that the assumptions for normality are met, and calculate the sample proportion and the standard error.
Transcribed Image Text:2. Ramsey County's 911 call center once published data on several years of phone calls (more than 800,000) for which 6% of the calls took more than 30 seconds to be answered. This seemed clearly unacceptable (imagine calling 911 in an emergency and waiting more than 30 seconds for an answer!) so steps were taken to reduce the time for an operator to answer. In the first month after the changes, there were 16,357 calls to the center, and in 932 of these calls the operator took more than 30 seconds to answer. Assume this first month of calls can be considered a random sample of calls. a. State the null hypothesis, Ho, and the alternative hypothesis, HA, that should be used to determine if the changes have reduced the percent of calls that are answered in more than 30 seconds. Ho: English version: Symbolic version: HA: English version: Symbolic version: b. Check that the assumptions for normality are met, and calculate the sample proportion and the standard error.
c. Calculate the z-score for the sample proportion, and use normalcdf to calculate the p-value. d. Using a significance level of 0.05, do you reject or fail to reject the null hypothesis? e. Interpret your conclusion in context, for your friend who has not taken statistics.
Transcribed Image Text:c. Calculate the z-score for the sample proportion, and use normalcdf to calculate the p-value. d. Using a significance level of 0.05, do you reject or fail to reject the null hypothesis? e. Interpret your conclusion in context, for your friend who has not taken statistics.
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 3 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Truth Tables
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.
Similar questions
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