Once an individual has been infected with a certain disease, let X represent the time (days) that elapses before the individual becomes infectious. An article proposes a Weibull distribution with a = 2.6, ß = 1.2, and y = 0.5. [Hint: The two-parameter Weibull distribution can be generalized by introducing a third parameter y, called a threshold or location parameter: replace x in the equation below, a { f(x; a, B) = -xα-¹e-(x/B) a Ba 0 Χ ΣΟ x < 0 by x - y and x ≥ 0 by x ≥ y.] (a) Calculate P(1 < X < 2). (Round your answer to four decimal places.) (b) Calculate P(X > 1.5). (Round your answer to four decimal places.) (c) What is the 90th percentile of the distribution? (Round your answer to three decimal places.) days (d) What are the mean and standard deviation of X? (Round your answers to three decimal places.) mean standard deviation days days

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
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Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 14PPS
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Once an individual has been infected with a certain disease, let X represent the time (days) that elapses before the individual
becomes infectious. An article proposes a Weibull distribution with a = 2.6, ß = 1.2, and y = 0.5. [Hint: The two-parameter Weibull
distribution can be generalized by introducing a third parameter y, called a threshold or location parameter: replace x in the
equation below,
f(x; a, B) =
α
Ba
xa
¹e-(x/B) a
0
Χ ΣΟ
x < 0
by x - y and x ≥ 0 by x ≥ y.]
(a) Calculate P(1 < X < 2). (Round your answer to four decimal places.)
(b) Calculate P(X> 1.5). (Round your answer to four decimal places.)
(c) What is the 90th percentile of the distribution? (Round your answer to three decimal places.)
days
(d) What are the mean and standard deviation of X? (Round your answers to three decimal places.)
mean
standard deviation
days
days
Transcribed Image Text:Once an individual has been infected with a certain disease, let X represent the time (days) that elapses before the individual becomes infectious. An article proposes a Weibull distribution with a = 2.6, ß = 1.2, and y = 0.5. [Hint: The two-parameter Weibull distribution can be generalized by introducing a third parameter y, called a threshold or location parameter: replace x in the equation below, f(x; a, B) = α Ba xa ¹e-(x/B) a 0 Χ ΣΟ x < 0 by x - y and x ≥ 0 by x ≥ y.] (a) Calculate P(1 < X < 2). (Round your answer to four decimal places.) (b) Calculate P(X> 1.5). (Round your answer to four decimal places.) (c) What is the 90th percentile of the distribution? (Round your answer to three decimal places.) days (d) What are the mean and standard deviation of X? (Round your answers to three decimal places.) mean standard deviation days days
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