1. The personnel director of a large corporation wants to study absenteeism among clerical workers at the corporation's central office during the year. A random sample of 25 clerical workers reveals the following: [20 points] ➤ Absenteeism: X=19.7 days, S = 5.0 days. 20 clerical workers were absent more than 12 days. a. Set up an 95% confidence interval estimate of the average number of absences for clerical workers last year. b. Set up a 90% confidence interval estimate of the population proportion of clerical workers absent more than 12 days last year. c. If the personnel director also wants to take a survey in a branch office, what sample size is needed if the director wants to be 95% confident of being correct to within ± 1.5 days and the population standard deviation is assumed to be 4.5 days? d. If the personnel director also wants to take a survey in a branch office, what sample size is needed if the director wants to be 99% confident of being correct to within ± 0.035 of the population proportion of workers who are absent more than 12 days if the population proportion is known to be 0.45. stigate Q Search مالة W
1. The personnel director of a large corporation wants to study absenteeism among clerical workers at the corporation's central office during the year. A random sample of 25 clerical workers reveals the following: [20 points] ➤ Absenteeism: X=19.7 days, S = 5.0 days. 20 clerical workers were absent more than 12 days. a. Set up an 95% confidence interval estimate of the average number of absences for clerical workers last year. b. Set up a 90% confidence interval estimate of the population proportion of clerical workers absent more than 12 days last year. c. If the personnel director also wants to take a survey in a branch office, what sample size is needed if the director wants to be 95% confident of being correct to within ± 1.5 days and the population standard deviation is assumed to be 4.5 days? d. If the personnel director also wants to take a survey in a branch office, what sample size is needed if the director wants to be 99% confident of being correct to within ± 0.035 of the population proportion of workers who are absent more than 12 days if the population proportion is known to be 0.45. stigate Q Search مالة W
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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Show all calculations for question 1 part a B c and d.
![1. The personnel director of a large corporation wants to study absenteeism among
clerical workers at the corporation's central office during the year. A random
sample of 25 clerical workers reveals the following: [20 points]
➤ Absenteeism:
X=19.7 days, S = 5.0 days.
20 clerical workers were absent more than 12 days.
a. Set up an 95% confidence interval estimate of the average number of absences
for clerical workers last year.
b. Set up a 90% confidence interval estimate of the population proportion of clerical
workers absent more than 12 days last year.
c. If the personnel director also wants to take a survey in a branch office, what
sample size is needed if the director wants to be 95% confident of being correct to
within ± 1.5 days and the population standard deviation is assumed to be 4.5
days?
d. If the personnel director also wants to take a survey in a branch office, what
sample size is needed if the director wants to be 99% confident of being correct to
within ± 0.035 of the population proportion of workers who are absent more than
12 days if the population proportion is known to be 0.45.
stigate
Q Search
مالة
W](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9f10e4db-b7e5-4cd9-b018-1a3fb1a1773e%2Fc0c9fe34-3f42-4547-8375-eacbd0f1e561%2F7ykzbo_processed.jpeg&w=3840&q=75)
Transcribed Image Text:1. The personnel director of a large corporation wants to study absenteeism among
clerical workers at the corporation's central office during the year. A random
sample of 25 clerical workers reveals the following: [20 points]
➤ Absenteeism:
X=19.7 days, S = 5.0 days.
20 clerical workers were absent more than 12 days.
a. Set up an 95% confidence interval estimate of the average number of absences
for clerical workers last year.
b. Set up a 90% confidence interval estimate of the population proportion of clerical
workers absent more than 12 days last year.
c. If the personnel director also wants to take a survey in a branch office, what
sample size is needed if the director wants to be 95% confident of being correct to
within ± 1.5 days and the population standard deviation is assumed to be 4.5
days?
d. If the personnel director also wants to take a survey in a branch office, what
sample size is needed if the director wants to be 99% confident of being correct to
within ± 0.035 of the population proportion of workers who are absent more than
12 days if the population proportion is known to be 0.45.
stigate
Q Search
مالة
W
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