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Describe when a z-test should be performed as opposed to a t-test? Which (if any) can we use all the time? Why or why not?
He (given that) the true proportion of perfect condition items is only 80% what is the probability that the lot will not be shipped?
Your performance as a principal depends on how well your entire group of eight-graders scores on the exam. What is the likelihood that your group of 115 eighth-graders will have an average score below 580?
using the experimental method had a mean of 29 minutes with a variance of 16 minutes. Use α = .10 for all tests.For a right-tail test of means (assume equal variances) the critical value is?
The article "Modeling Sediment and Water Column Interactions for Hydrophobic Pollutants"(Water Research [1984]: 1169-1174) suggests the uni- form distribution on the interval from 7.5 to 20 as a model for x = depth (in centimeters) of the bioturbatio..
Consider the following frequency table of the performance ratings on a scale of 1-good, 2-fair, and 3-poor, bestowed on their local baseball team by a collection of 100 fans:
Find the rank or Spearman correlation coefficient between the midterm grade and the IQ ranking of a random sample of 10 students in a large class.
contrast the loss due to overstocking and the loss due to understocking. in addition to simple inventory problems to
Now suppose he says that if he is optimistic about the success of one project, he is likely to be optimistic about the others as well. For your simulation, this means that if one of the probabilities increases, the others also are likely to increa..
question an automobile manufacturer markets the same vehicle in europe and the u.s. but buyer quality ratings are
Suppose the weights of pucks produced at a factory are normally distributed with a mean of 5.75 ounces and a standard deviation of .11 ounce. What percentage of the pucks produced at this factory cannot be used by the National Hockey League?
question lottery. one million tickets are sold for a lottery in which a single prize will be awardeda if you purchase a
twelve of the top 20 finishers in the 2009 pga championship at hazeltine national golf club in chaska minnesota used a
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