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1. Suppose the salary of assembly line workers has Normal distribution with mean of $20,000, and standard deviation of $3,000.

a) What is the probability that a randomly selected assembly line worker earns more than $22,000?

b) What is the probability that the average salary of 5 assembly line workers is higher than $22,000?

c) What is the probability that the average salary of 15 assembly line workers is higher than $22,000?

2. Our client asked us to compute a 97% confidence interval for the time it takes to build a house in Kamloops. There are 32 observations in our sample. The sample mean is 60 days.

a) What is the 99% confidence interval, if the population standard deviation is known to be 10 days?

b) What is the 99% confidence interval, if the sample standard deviation is 10 days

c) Find the 80% confidence interval, if the population standard deviation is known to be 10 days.

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M9375384

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