A company reported that 76% of 1700 randomly selected college freshmen returned to college the next year. The study was stratified by type of college-public or private. The retention rates were 72.7% among 510 students enrolled in public colleges and 77.4% among 1190 students enrolled in private colleges. The company found 95% confidence intervals for retention rates. Suppose that the company wants to update its information on the percentage of freshmen that return for a second year of college. Complete parts a and b below. a) It wants to cut the stated margin of error in half. How many college freshmen must be surveyed? 0 (Type a whole number.) b) Do you have any concerns about this sample? Explain. Select all that apply. A. Because the sample is stratified, there is a greater risk of greater sampling error. B. The sample size is very small, which may reduce the level of certainty associated with the interval. C. Because the sample is stratified, the Independence Assumption may be violated. D. The sample size is very large, which may make the survey difficult and expensive E. The 10% Condition would probably be violated by this sample. F. The Success/Failure Condition would probably be violated by this sample. G. There are no reasonable concerns about this sample. administer.
A company reported that 76% of 1700 randomly selected college freshmen returned to college the next year. The study was stratified by type of college-public or private. The retention rates were 72.7% among 510 students enrolled in public colleges and 77.4% among 1190 students enrolled in private colleges. The company found 95% confidence intervals for retention rates. Suppose that the company wants to update its information on the percentage of freshmen that return for a second year of college. Complete parts a and b below. a) It wants to cut the stated margin of error in half. How many college freshmen must be surveyed? 0 (Type a whole number.) b) Do you have any concerns about this sample? Explain. Select all that apply. A. Because the sample is stratified, there is a greater risk of greater sampling error. B. The sample size is very small, which may reduce the level of certainty associated with the interval. C. Because the sample is stratified, the Independence Assumption may be violated. D. The sample size is very large, which may make the survey difficult and expensive E. The 10% Condition would probably be violated by this sample. F. The Success/Failure Condition would probably be violated by this sample. G. There are no reasonable concerns about this sample. administer.
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:A company reported that 76% of 1700 randomly selected college freshmen returned to college the next year. The study was stratified by type of college-public or private. The retention rates were 72.7% among 510 students enrolled in public colleges and 77.4% among 1190
students enrolled in private colleges. The company found 95% confidence intervals for retention rates. Suppose that the company wants to update its information on the percentage of freshmen that return for a second year of college. Complete parts a and b below.
a) It wants to cut the stated margin of error in half. How many college freshmen must be surveyed?
(Type a whole number.)
b) Do you have any concerns about this sample? Explain.
Select all that apply.
A. Because the sample is stratified, there is a greater risk of greater sampling error.
B. The sample size is very small, which may reduce the level of certainty associated with the interval.
C. Because the sample is stratified, the Independence Assumption may be violated.
D. The sample size is very large, which may make the survey difficult and expensive to administer.
E. The 10% Condition would probably be violated by this sample.
F. The Success/Failure Condition would probably be violated by this sample.
G. There are no reasonable concerns about this sample.
C
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