Confidence interval for the proportion
Calculate the 95% confidence interval for the proportion if: p=0.55 and n = 400
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How many different numbers can be formed by rearranging the digits of 858,585,555?
The scores for females on the critical reading portion of the SAT are normally distributed, with a mean of 493 and a standard deviation of 112. Random samples of size 36 are drawn from this population, and the mean of each sample is determined.
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Twenty balls are numbered 1 through 20 and placed in a box. A ball is randomly selected and placed back into the box. Then a second ball is randomly selected. What is the probability that the first ball's number is evenly divisible by 4 and the se
DFR Company has a service standard of 4.0 hours or less. During one week, a sample of 25 calls resulted in a sample mean of 7.0 hours with a sample standard deviation 10.0. can we conclude, statistically speaking, that the mean service time exceed
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1. In any given year, the number of huricanes that hit the Florida gulf coast has a Poisson distribution. The parameter of the distribution is itself random, and assumed to be uniformly distributed on the range [0,5].
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