12. 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? 98% 90% 99% 95% O O O O

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12. 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?
98%
90%
99%
95%
O O O O
Transcribed Image Text:12. 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? 98% 90% 99% 95% O O O O
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