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| Teaching Since: | May 2017 |
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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
A sample of 35 workers was randomly selected from a workforce of 110 to estimate the average amount spent weekly at the canteen. The sample mean was £5.40 and the sample standard deviation was £2.24: a. Calculate a 95 per cent confidence interval for the mean.
b. What sample size would be required to estimate the mean to within ±£0.50 with a 95 per cent confidence interval?
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