Unformatted text preview: ¯ x = 4 . 17. Determine the 90 % conﬁdence interval for the population mean when the estimate variance of the population is 5.76. 4. Let ¯ x be the mean of a random sample of size n from a distribution which is N ( μ, σ 2 ) where σ 2 = 90. Find n such that P (¯ x − 1 ≤ μ ≤ ¯ x + 1) = 0 . 9 approximately....
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 Spring '12
 D.S.G.Pollock
 Statistics, Probability theory, 90 %, series A

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