Chap 5 HW.docx - 5.43 A E)= p=.15 B St Dev = p(1P\/n =.15 1.15 =.0160 500 C The sampling distribution will be about normal because the sample size is

# Chap 5 HW.docx - 5.43 A E)= p=.15 B St Dev = p(1P/n =.15...

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5.43: A) E(ṕ)= p= .15 B) St. Dev ṕ= p ( 1 P )/ n = .15 ( 1 .15 ) 500 = .0160 C) The sampling distribution will be about normal because the sample size is large. D) E) 5.47: The probability that a guest was delighted and would recommend is p= .15(.80)= .12 o µ ṕ= p= .12 o St. Dev ṕ = p ( 1 P )/ n = .12 ( 1 .12 ) 100 = . 0325 5.51: µ ṕ= p= .90; St. Dev ṕ = p ( 1 P )/ n = .90 ( 1 .90 ) 75 = .0346
Due to the probability of .0019 being so small, we can assume that users who have had problems with their apps not working on their phone is less than 90% 5.67: A) The sampling distribution of ẋ is approximately normal; µẋ= µ and σ = σ n = σ 50 B) µẋ= µ= 40; σ = σ n = 12 50 = 1.6971 C)   2  / n  40  2 1.6971

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• Spring '08
• Deshmikh
• Probability, 90%, σx, St. Dev

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