7. The argument has been made that citizens can play a key role in the control of crime. One way to measure citizen involvement in crime control is through the number of calls they make requesting the services of the police (i.e., calls for service). You are interested in learning if the number of calls for service varies across regions in the United States. In the past year, the average number of 911 calls recorded for all large cities in the United States was 8,994 with a standard deviation of 401 (assume the population is normally distributed). You take a sample of 9 large cities in the South and compute the mean number of calls for your sample service. a. What is the expected value of your sample mean? b. What is the standard error for a sample of 9 cities? c. Interpret what the number you computed tells you. d. The mean for your sample of 9 cities is 8734. Find the z- score corresponding to your sample mean.
7. The argument has been made that citizens can play a key role in the control of crime. One way to measure citizen involvement in crime control is through the number of calls they make requesting the services of the police (i.e., calls for service). You are interested in learning if the number of calls for service varies across regions in the United States. In the past year, the average number of 911 calls recorded for all large cities in the United States was 8,994 with a standard deviation of 401 (assume the population is normally distributed). You take a sample of 9 large cities in the South and compute the mean number of calls for your sample service. a. What is the expected value of your sample mean? b. What is the standard error for a sample of 9 cities? c. Interpret what the number you computed tells you. d. The mean for your sample of 9 cities is 8734. Find the z- score corresponding to your sample mean.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.6: Summarizing Categorical Data
Problem 27PPS
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I’m stuck on this question and would know what answers and work are for them are. Thank you, its statistics mixed with criminal justice.
Transcribed Image Text:7. The argument has been made that citizens can play a key
role in the control of crime. One way to measure citizen
involvement in crime control is through the number of calls
they make requesting the services of the police (i.e., calls
for service). You are interested in learning if the number of
calls for service varies across regions in the United States.
In the past year, the average number of 911 calls recorded
for all large cities in the United States was 8,994 with a
standard deviation of 401 (assume the population is
normally distributed). You take a sample of 9 large cities in
the South and compute the mean number of calls for your
sample service.
a. What is the expected value of your sample mean?
b. What is the standard error for a sample of 9 cities?
Interpret what the number you computed tells you.
d. The mean for your sample of 9 cities is 8734. Find the z-
score corresponding to your sample mean.
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