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A bookshelf contains 20 textbooks for different subjects. Among those, 10 of them are used ones, and 10 of them are brand new. You select 2 books and sell one at a time on Oct 11, and Oct 12.
Find the probability that the book you will sell on Oct 11 is used one given that the book you will sell on Oct 12 is brand new.
a pair of dice is rolled 10 times. what is the probability that a sum of seven is observed at most three
Evaluate the difference in the mean ratings and find the standard deviation of the difference in the ratings, what is the chance both children are boys?
question a published report claims that 7.3 of vehicle fatalities involve motorcyclists. an insurance investigator
on friday wall street traders were anxiously awaiting the federal governments release of numbers on the january
In a large metropolitan area, past records revealed that 30 percent of all the high school graduates go to college. Each student's choice to go to college is independent. From 20 graduates selected at random, what is the probability that exactly 8 wi..
heights of trees in a forest are normally distributed with mean 50 feet and standard deviation 12 feet. in a random
You have been asked to analyse Grand Plomp Ltd, a maker of rocket widgets used by NASA. The owners are wondering whether the return received is sufficient to justify the risks taken in each division.
the moisture x of the wet mix of a product is considered to have an effect on the density y of the finished product.
Researcher expects 12 point treatment effect and plans to use two-tailed hypothesis test with u α = .05. Calculate the power of test if researcher uses a sample of n = 16 individuals.
allen young has always been proud of his personal investment strategies and has done very well over the past several
An election poll reported that a candidate had an approval rating of 49% with a margin of error E of 2%. Construct a confidence interval for the proportion of adults who approve of the candidate.
an experimenter wants to conduct a hypothesis test on a claim that there was no difference between two population
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