An office manager wishes to estimate the mean time required to handle a customer complaint. A sample of 38 complaints shows a mean of 28.7 min and standard deviation of 12 min. construct a 90%...
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Type: Posts; User: captainminhas
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Feb 15, 2011, 04:55 PM
Question: 90% confidence interval
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90% confidence interval
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Feb 15, 2011, 04:48 PM
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given random sample find probability that sample mean?
X has normal distribution with mean of 107 and a standard deviation of 1.5 .if a sample of 25 students is selected at random, find the probability that sample mean is greater than 110?
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