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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.
the total blood cholesterol concentrations in mgdl are shown below for a random sample of six people. in the table
Suppose the standard deviation of the minimum temperature in February is 6 degrees Upper F6°F and that the distribution of minimum temperatures in February is approximately Normal.
All the pupils took the same achievement test, and the means for groups receiving different methods were compared. What was the dependent variable?
For a certain stock, the price of a call option is 7.80 and the price of the corresponding put option with the same strike price and expiration date is 1.50. Find the new price of the put option.
There are four auto body shops in a community and all claim to promptly serve customers. To check if there is any difference in service customers are randomly selected from each repair shop and their waiting times in days are recorded.
Land in Canada. Choose an acre of land in Canada at random. The probability is 0.45 that it is forest and 0.03 that it is pasture.
For a normal random variable with mean 19,500 and standard deviation 400, find a point of the distribution such that the probability that the random variable will exceed this value is 0.02.
two parts are assembled. the distributions of x1 and x2 are normal with micro1 20 s1 0.3 and micro2 19.6 s2 0.4.
Jim Sears manufactures farm equipment. His work requires the use of steel bars which must have a mean length of at least 50 inches. The bars can be purchased from a supplier in Kansas
compute a qq plot against a normal distribution with a mean of 5 and standard deviation of 1 and test for the goodness
Pottery. An artist experimenting with clay to create pottery with a special texture has been experiencing difficulty with these special pieces.
What's the probability that a randomly chosen voter favors the death penalty?- What's the probability that a Republican favors the death penalty?
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