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In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities. More than a decade ago, high levels of lead in the blood put 86% of children at risk. A concerted effort was made to remove lead from the environment. Now, suppose only 10% of children in the United States are at risk of high blood-lead levels.
(a) In a random sample of 180 children taken more than a decade ago, what is the probability that 50 or more had high blood-lead levels? (Round your answer to three decimal places.)
(b) In a random sample of 180 children taken now, what is the probability that 50 or more have high blood-lead levels? (Round your answer to three decimal places.)
If you have a population that has a small sample, but does not meet all of the criteria for the nonparametric test how can you tell what test to use?
a witness to a hit-and-run accident told the police that the license number contained the letters rlh followed by 3
the test scores of a class consisting of 30 students are given in the table below. perform thenbspchi-square and the
1. Willow Brook National Bank operates a drive-up teller window that allows customers to complete bank transactions without getting out of their cars. On weekday mornings, arrivals to the drive-up teller window occur at random, with an arrival ..
The Investment Research Institute reported in its Mutual Fund Fact Book that the number of mutual funds increased from 5725 in 1999 to 7977 in 2009. What is the geometric mean annual percent increase in the number of funds?
Assume that the order of the salespeople on the list is relevant.
What are the implications to a business if the forecast is too high - show a graph of the historical and forecasted sales in one graph
A wildlife biologist wants to do a test to see if there is a genetic trait linked to industrial toxins. Previous research says the trait is usually found in one out of every thirty frogs.
Recent crime reports indicate that 5.2 motor vehicle thefts occur each minute in the United States. Assume that the distribution of thefts per minute can be approximated by the Poisson probability distribution.
In how many ways can a committee of 6 members be selected from out of these 12? Find the probability that a random committee contains all males?
msa computer corporation manufactures two models of minicomputers the alpha 4 and beta 5. the firm employs 5
In a random sample of 200 person of a town 120 are found to the tea drinker.In a random sample of 500 person of another town 240 are found to be tea drinker.Is the proprtion of tea drinker in the two towns are equal? use .001 level significance.
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