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HW6Sol - STAT 3011 HW 6 Solution Instructor Alicia Johnson...

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STAT 3011 HW 6 Solution Instructor: Alicia Johnson 6.38 (a) The distribution of X is Binomial (n, p), with n = 4, p = 1/5. (b) (c) 6.42 (a) The distribution of X is Binomial (n, p), with n = 3000, p = 0.5. (b) (c) The expected number of voters who voted in favor of a special proposition designed to lower property taxes and raise the sales tax is 1500. (d) Based on part (b), the approximation is normal distribution with mean 1500 and standard deviation 27.4. (e) z = (1550 – 1500) / 27.4 = 1.82 Pr ( Z > 1.82) = 0.03401425 7.14 1
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7.18 (a) When the sample size n is large enough, the sample mean x-bar will be very close to the true population mean u.
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