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42. To work in the word-processing department at Dewey, Cheatem, and Howe, a large center-city law firm, you must be able to type at least 80 words per minute. The director of the human resources department is revising the job description from 15 samples. The mean typing speed is 93 words per minute with a standard deviation of 7 words per minute. Assume that typing speeds follow an approximately normal distribution. What is the confidence level of the interval (88.26, 97.74) for the mean number of words typed by word processors at his law firm? 95% 90% 98% 99% O O

42. To work in the word-processing department at Dewey, Cheatem, and Howe, a large center-city law firm, you must be able to type at least 80 words per minute. The director of the human resources department is revising the job description from 15 samples. The mean typing speed is 93 words per minute with a standard deviation of 7 words per minute. Assume that typing speeds follow an approximately normal distribution. What is the confidence level of the interval (88.26, 97.74) for the mean number of words typed by word processors at his law firm? 95% 90% 98% 99% O O

MATLAB: An Introduction with Applications
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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42. To work in the word-processing department at Dewey, Cheatem, and Howe, a large center-city law firm, you must be able to type at least 80 words per minute. The director of the human resources department is revising the job description from 15 samples. The mean typing speed is 93 words per minute with a standard deviation of 7 words per minute. Assume that typing speeds follow an approximately normal distribution. What is the confidence level of the interval (88.26, 97.74) for the mean number of words typed by word processors at his law firm? 95% 90% 98% 99% O O O O
Transcribed Image Text:42. To work in the word-processing department at Dewey, Cheatem, and Howe, a large center-city law firm, you must be able to type at least 80 words per minute. The director of the human resources department is revising the job description from 15 samples. The mean typing speed is 93 words per minute with a standard deviation of 7 words per minute. Assume that typing speeds follow an approximately normal distribution. What is the confidence level of the interval (88.26, 97.74) for the mean number of words typed by word processors at his law firm? 95% 90% 98% 99% O O O O
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