An admissions director wants to estimate the mean age of all students enrolled at a college. The estimate must be within 1 year. The ages are not normally distributed so the director knows she will need a sample of at least 30. Determine the minimum required sample size to construct a 99% confidence interval for the population mean. Assume the population standard deviation is 4.8 years (a= 4.8). On = 48 On = 62 On = 114 On = 153

Algebra and Trigonometry (6th Edition)
6th Edition
ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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An admissions director wants to estimate the
mean age of all students enrolled at a college.
The estimate must be within 1 year. The ages are
not normally distributed so the director knows
she will need a sample of at least 30.
COLLEGE
Ta出介
Determine the minimum required sample size to
construct a 99% confidence interval for the
population mean. Assume the population
standard deviation is 4.8 years (a=48).
On = 48
On = 62
On = 114
On = 153
Transcribed Image Text:An admissions director wants to estimate the mean age of all students enrolled at a college. The estimate must be within 1 year. The ages are not normally distributed so the director knows she will need a sample of at least 30. COLLEGE Ta出介 Determine the minimum required sample size to construct a 99% confidence interval for the population mean. Assume the population standard deviation is 4.8 years (a=48). On = 48 On = 62 On = 114 On = 153
What is the critical value, :, associated with a 95% confidence interval?
95%
OFEcal Value
(2-50ore)
Gridcal Value
(-300re)
O 0.950
O 1.645
1.960
2.575
50°F C
Transcribed Image Text:What is the critical value, :, associated with a 95% confidence interval? 95% OFEcal Value (2-50ore) Gridcal Value (-300re) O 0.950 O 1.645 1.960 2.575 50°F C
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