Mathematics, 18.09.2019 02:30 Brittpaulina
Arandom sample of 12 graduates of a certain secretarial school typed an average of 79.3 words per minute with a standard deviation of 7.8 words per minute. assuming a normal distribution for the number of words typed per minute, find a 95% confidence interval for the average number of words typed by all graduates of this school.
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Arandom sample of 12 graduates of a certain secretarial school typed an average of 79.3 words per mi...
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