A Population Variable Has a Distribution with a Mean of

question 14

Multiple Choice

A population variable has a distribution with a mean of  = 50 and a variance of ² = 225.From this population a simple random sample of n observations is to be selected and the mean of the sample values calculated.How big must the sample size n be so that the standard deviation of the sample mean is equal to 1.4 (i.e. , = 1.4) ?

• A)n = 11
• B)n = 161
• C)n = 115
• D)n = 36
• E)n = 21

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