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Suppose that a certain college class contains 65 students of these, 35 are seniors, 37 are economic majors, and 7 are neither A student is selected at random from the classa) What is the probability that the student is both a senior and an economics major?
Merta reports that 74% of its trains are on time. A check of 60 randomly selected trains shows that 38 of them arrived on time. Find the probability that among the 60 trains 38 or fewer arrive on time.
A jar contains 12 marbles, 5 of which are blue and 7 of which are red. If 4 marbles are chosen at random and without replacement, what is the probability of selecting 3 blue ones and 1 red one?
correlation and regressiondebate the following statement correlation means causation. determine whether this statement
Choice of exponential smoothing constant w has little or no effect on forecast values using exponential smoothing.
How to explain the influences on z-scores with constant variables in hypothesis tests with
Describe the purpose of transforming raw scores into standard scores. Describe what "normal distribution" means.
Ninety of these flashlights are selected at random from the production line to be tested, and 15 are found to be defective. The population is?
The average number of unoccupied seats was calculated? How large should the sample have been if a margin of error of 0.25 seats was desired?
What size sample would be required to estimate the proportion of unemployed college students if we want the margin of error not to exceed 3 percent?
question a process for the manufacture of penicillin was studied. there were five variants of the basic process being
Compute the difference scores for following data from repeated-measures study.
Can we conclude, at the level of significance, that the mean lifetime of light bulbs made by this manufacturer differs from months? Perform a two-tailed test.
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