MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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A random sample of 16 graduates of a certain secretarial school typed an average of 76.7 words per minute with a standard deviation of 8.2 words per minute.
Assuming a normal distribution for the number of words typed per minute, find a 90% confidence interval for the average number of words typed by all graduates of this
school.
Click here to view page 1 of the standard normal distribution table.
Click here to view page 2 of the standard normal distribution table.
Click here to view page 1 of the table of critical values of the t-distribution.
Click here to view page 2 of the table of critical values of the t-distribution.
.....
The confidence interval is
<µ<
(Round to two decimal places as needed.)
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Transcribed Image Text:A random sample of 16 graduates of a certain secretarial school typed an average of 76.7 words per minute with a standard deviation of 8.2 words per minute. Assuming a normal distribution for the number of words typed per minute, find a 90% confidence interval for the average number of words typed by all graduates of this school. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. Click here to view page 1 of the table of critical values of the t-distribution. Click here to view page 2 of the table of critical values of the t-distribution. ..... The confidence interval is <µ< (Round to two decimal places as needed.)
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