A leading magazine (like Barron's) reported at one time that the average number of weeks an individual is unemployed is 30 weeks. Assume that the length of unemployment is normally distributed with population mean of 30 weeks and the population standard deviation of 9 weeks. Suppose you would like to select a random sample of 39 unemployed individuals for a follow-up study. Round the answers of following questions to 4 decimal places. a. What is the distribution of X? X N(( 30 9. b. What is the distribution of ? - N( 30 c. What is the probability that one randomly selected individual found a job more than 29 weeks? d. For 39 unemployed individuals, find the probability that the average time that they found the next job is more than 29 weeks. e. For part d), is the assumption of normal necessary? O YesO No

Question

Answer C D and E 

A leading magazine (like Barron's) reported at one time that the average number of weeks an individual is
unemployed is 30 weeks. Assume that the length of unemployment is normally distributed with population
mean of 30 weeks and the population standard deviation of 9 weeks. Suppose you would like to select a
random sample of 39 unemployed individuals for a follow-up study. Round the answers of following
questions to 4 decimal places.
a. What is the distribution of X? X N(( 30
9.
b. What is the distribution of ? - N( 30
c. What is the probability that one randomly selected individual found a job more than 29 weeks?
d. For 39 unemployed individuals, find the probability that the average time that they found the next
job is more than 29 weeks.
e. For part d), is the assumption of normal necessary? O YesO No
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Transcribed Image Text

A leading magazine (like Barron's) reported at one time that the average number of weeks an individual is unemployed is 30 weeks. Assume that the length of unemployment is normally distributed with population mean of 30 weeks and the population standard deviation of 9 weeks. Suppose you would like to select a random sample of 39 unemployed individuals for a follow-up study. Round the answers of following questions to 4 decimal places. a. What is the distribution of X? X N(( 30 9. b. What is the distribution of ? - N( 30 c. What is the probability that one randomly selected individual found a job more than 29 weeks? d. For 39 unemployed individuals, find the probability that the average time that they found the next job is more than 29 weeks. e. For part d), is the assumption of normal necessary? O YesO No

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