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A researcher conducted a study in which children with problems learning mathematics were offered the opportunity to purchase time with special tutors. The number of weeks that children met with their tutuors varied from 1 to 20.
He found that the number of weeks of tutoring predicted mathematics performance in these children and recommended that parents of such children send them for tutoring for as many weeks as possible-for two years if they could afford it. List three problems with that interpretation and explain why each is a problem.
Statistical aptitude scores are known to be normally distributed, with mean = 50. A researcher has designed a new program intended to improve students statistical aptitude, and has enrolled a sample of 30 students in it.
Consider the following hypothetical circumstance. Imagine that within the past three months The Body Builder magazine has added five additional pages of advertising to its weekly issue. These pages have been added on a test basis and were only inc..
an investigator wants to test if there is a difference in endotoxin levels in children who are exposed to endotoxin as
How do modern horror films (like silence of the lambs) differ from older horror films (like psycho)? Make sure that you give examples.
suppose that incoming lots are 0.5 nonconforming. what is the probability of rejecting these lots under both
Determine percent of the garages take between 29 hours and 34 hours to erect? Determine percent of garages take 28.7 hours or less to erect?
a survey was completed and the following two wage classes were used 4 - 7 and 7 - 10. what is the class interval for
What are some typical applications of the Binomial and the Poisson probability distribution? Explain with examples. When is the Hypergeometric distribution used?
The researchers measure how many minutes it takes for half of the substance to exit the bloodstream. What kind of variable is the company studying?
consider a random sample of size n from a poisson distribution xi poim.a find the crlb for the variances of
As a requirement of good design the experimenter must choose doses at which the probability of surviving is 0.20, 0.50, and 0.80. What three doses should he choose?
Assuming that the conditions for the binomial distribution are satisfied, what is the probability that the sample will lead Ziteck to reject the shipment if the defect rate is actually 0.05?
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