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A new kind of alkaline battery is believed to last an average of 25 hours of continuous use (in a given kind of flashlight). Assume that the population standard deviation is 2 hours.
If a random sample of 100 batteries is selected and tested, is it likely that the average battery in the sample will last less than 24 hours of continuous use? Explain.
a group of n men and m women is randomly lined up. find the expected number of men who are next to at least one woman.
the weights of men are normally distributed with mean of 173 lb and a sd of 30 lb. suppose we choose a random sample of
Assuming that the population variances are equal for male and female Grade Point Averages (GPAs), use the following sample data to test whether the averages are different at the 0.05 level of significance.
1.according to a recent survey 275 of 400 middle-aged americans said they used the internet regularly. 140 of 400
1.a rbd on the number of insects was performed yielding the following table. test the constrast if insecticide 1 and 2
Find a 95% confidence interval for the population proportion of consoles with this scratch defect.
A researcher hypothesizes that parents with school-aged children are more likely to vote in favor of a referendum increasing public school construct a zero order school referendum attitude table by parenting status?
We consider a system made up of two subsystems placed in parallel. The first subsystem is composed of two components (components nos. 1 and 2) placed in parallel, while the second subsystem comprises a single component (component no. 3). Let Sk de..
How many months had no days with 0.5 inches or more of precipitation? What proportion of months had no days with 0.5 inches or more of precipitation? Construct a 95% confidence interval for the proportion of months that had no days with 0.5 inches..
A national survey of engineering school graduates indicates that only 10% of them have had a course in statistics. (a) Find the probability that in a random sample of five engineering grad uates exactly two have had a course in statistics.
Tthe probability distribution of each of his readings had a mean of 128 and a standard devation of 9. what is the probability of the sample mean that exceeds 140?
a small business specialty homemade candies to anwhere in the world. past records indicate that the weight of orders is
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