SHOW CALCULATIONS TO GET FULL CREDIT 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: = 19.7 days, S = 5.0 days. 20 clerical workers were absent more than 12 days. Set up an 95 % confidence interval estimate of the average number of absences for clerical workers last year. Set up a 90% confidence interval estimate of the population proportion of clerical workers absent more than 12 days last year. 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? 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.
SHOW CALCULATIONS TO GET FULL CREDIT 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: = 19.7 days, S = 5.0 days. 20 clerical workers were absent more than 12 days. Set up an 95 % confidence interval estimate of the average number of absences for clerical workers last year. Set up a 90% confidence interval estimate of the population proportion of clerical workers absent more than 12 days last year. 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? 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.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 1GP
Question
SHOW CALCULATIONS TO GET FULL CREDIT
- 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: = 19.7 days, S = 5.0 days.
20 clerical workers were absent more than 12 days.
- Set up an 95 % confidence
interval estimate of the average number of absences for clerical workers last year.
- Set up a 90% confidence interval estimate of the population proportion of clerical workers absent more than 12 days last year.
- 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?
- 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.
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