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Question 8 A random sample of wage earners in Sydney produced the following summary information regarding annual gross income. n =1000 X = $66000 s

Question 8

A random sample of wage earners in Sydney produced the following summary information regarding annual gross income.

n =1000 X = $66000 s = $15000

A 95% confidence interval for the mean annual income is: a) 66,000 29.40 b) 66,000 780.29 c) 66,000 474.34

d) 66,000 929.71 e) Cannot be determined unless annual income is normally distributed.

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