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Question: One line from the National lottery was 18, 19, and 21,30,34,46. It is known that the parent Population has a standard deviation of 14.3.Calculate the (a) 90% and (b) 95% confidence intervals for the mean of the population.  Edit

Answer: M = 28
Z = 1.64
S = ?(14.32/6) = 5.84

? = M ± Z(S)
? = 28 ± 1.64*5.84
? = 28 ± 9.6
90% CI [18.4, 37.6]

95% CI [16.56, 39.44]  Edit


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