Eighty workers were randomly divided into two sets of forty each. Each set spent two weeks in a self - training program that was designed to teach a new production technique. The first set of workers was accompanied by a supervisor whose only job was to check that the workers were all paying attention. The second group was left on its own. After the program ended, the workers were tested. The following results were as follows: Sample Mean Sample St. Dev. Supervised group Unsupervised group 70.6 8.4 77.4 7.4 Estimate the true difference between the two population means using 95% confidence interval. O a. 6.8 ± 2.265 O b.6.8 + 3.204 O c. 6.8 ± 4.124 O d. 6.8 ± 3.469 O e. 6.8 ± 2.911
Eighty workers were randomly divided into two sets of forty each. Each set spent two weeks in a self - training program that was designed to teach a new production technique. The first set of workers was accompanied by a supervisor whose only job was to check that the workers were all paying attention. The second group was left on its own. After the program ended, the workers were tested. The following results were as follows: Sample Mean Sample St. Dev. Supervised group Unsupervised group 70.6 8.4 77.4 7.4 Estimate the true difference between the two population means using 95% confidence interval. O a. 6.8 ± 2.265 O b.6.8 + 3.204 O c. 6.8 ± 4.124 O d. 6.8 ± 3.469 O e. 6.8 ± 2.911
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:Eighty workers were randomly divided into two sets of forty each. Each set spent two weeks in a self - training program
that was designed to teach a new production technique. The first set of workers was accompanied by a supervisor whose
only job was to check that the workers were all paying attention. The second group was left on its own. After the program
ended, the workers were tested. The following results were as follows:
Sample Mean
Sample St. Dev.
Supervised group
Unsupervised group
70.6
8.4
77.4
7.4
Estimate the true difference between the two population means using 95% confidence interval.
O a. 6.8 ± 2.265
O b. 6.8 ± 3.204
O c. 6.8 ± 4.124
O d. 6.8 ± 3.469
O e. 6.8 ± 2.911
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