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A painter has learned that the time it takes her to paint a random room in a house is normally distributed with a mean of 4 hours and a standard deviation of 45 minutes. id she is just starting work on a random room and has to leave in five hours, find
a. The probability she can have lunch before she has to leave if she needs 30 minutes for lunch.
b. The probability she does not finish before she leaves.
c. The probability she works for more than 3 hours (don ,t forget she will stop working to leave on time).
What is the 99% confidence interval for the true proportion of all e-mail subscribers that opened the e-mail within 24 hours of receiving it?
What is the difference between a normal distribution and a standard normal distribution? What is the purpose of using a standard normal distribution instead of the normal distribution?
1. what is sampling? briefly explain the various methods of sampling.2. a company appoints four salesmen a b c and d
if arrivals occur at a mean rate of 3.6 events per hour the exponential probability of waiting less than 0.5 hour for
Conduct a statistical test to determine if the sample is representative of the population.
Is there sufficient evidence to support the claim that site has an effect on the amount of pesticide?
The president of a bank is attempting to arrange a meeting with the three vice presidents for a friday
Two semiconductor factories are being compared to see if there is a difference in the average defect rates of the chips they produce. In the first factory, 250 chips are sampled. In the second factory, 350 chips are sampled. The proportions of def..
If we select 84 students (ASSUME INDEPENDENCE), what is the Standard Deviation of the Probability Distribution that would list the number of students.
A IRS auditor randomly selects 3 tax returns from 57 returns of which 6 contains errors. What is the probability that she selects none of those containing errors?
You construct a 90% confidence interval for the average stock price to be (267.348, 279.472). Of the following choices, what is the approporiate interpretation of this interval?
The Weschsler IQ test has a μ =100 and a σ = 15. A vitamin company said if people took vitamin X for 30 days their IQ would improve. A simple random sample of 49 people took the vitamins for 30 days. They then took the IQ test. The mean IQ of the ..
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