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.
calculate the 90% confidence interval for the population mean if: x-bar is 95, sigma= 0.8, and n= 16.
With a certain scratch-off lottery ticket a player can either win $100 or win nothing. The probability that a person wins $100 on a single ticket is 0.258. If Andy buys 10 tickets, what is the probability of winning $100 each on 2 of the 10 ticket
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
A ball is drawn from urn A and then transferred to urn B. After that a ball is drawn from urn B. What is the probability the transferred ball was black given that the second ball drawn was white? (Round your answer to the nearest hundredth.)
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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