10.38 Aimed at finding monthly tips earned by the waiter and waitress in a restaurant, a random...
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10.38 Aimed at finding monthly tips earned by the waiter and waitress in a restaurant, a random sample of 11 waiters at a restaurant showed that the mean monthly tips earned by them was $67.058, and the sample standard deviation was $12.50. An independent random sample of 9 waitresses in the same restaurant showed mean monthly tips earned of $78 and a standard deviation of $8.14. Assume that the two population distributions are normal with equal standard deviations.
Test, at the 5% level, the null hypothesis that the population mean monthly tips earned are the same against the alternative that the true mean is higher for waitresses.
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Related Book For
Essential Mathematics And Statistics For Science
ISBN: 9780470694480
2nd Edition
Authors: Graham Currell, Dr. Antony Dowman
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