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, 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, ß) = {Ba x20 x< 0 by x - y and x 2 0 by x 2 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.)
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, 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, ß) = {Ba x20 x< 0 by x - y and x 2 0 by x 2 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.)
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.1: Measures Of Center
Problem 9PPS
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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 = 1.8,
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,
:- le-(x/B)a
f(x; a, B) =
x 2 0
x < 0
by x - y and x 2 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
days
standard deviation
days](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fee8fb823-9e56-4d34-a863-64debae68570%2F61f2080c-7bae-4e43-99f8-ec91ca127635%2Fky325lh_processed.png&w=3840&q=75)
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 = 1.8,
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,
:- le-(x/B)a
f(x; a, B) =
x 2 0
x < 0
by x - y and x 2 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
days
standard deviation
days
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