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Unformatted text preview: P ( Z 2 . 08) = 0 . 0188. less then 2% of the time we would see p as large or larger then 0.35. Which implies it is an unusual value. Question 4: a. P ( 1 . 96 < X < + 1 . 96 ) = P (1 . 96 < Z < 1 . 96) = 0 . 95 b. P ( 2 . 5 < X < + ) = P (2 . 5 < Z < ) = 0 . 95 P ( Z )P ( Z 2 . 5) = . 95 P ( Z ) = 0 . 95 + 0 . 0062 = 0 . 9562 = 1 . 71 Length of the interval in part (a) = 2(1 . 96 ) = 3 . 92 Length of the interval in part (b) (1 . 71(2 . 5)) = 4 . 21 c. Draw the picture and see how you move one bound of the interval will aect the other bound when the total area is kept constant....
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 Spring '10
 AugustineWong
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