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Balls are drawn (one at a time) from an urn containing 50 balls numbered from 1 to 50. The ball is kept if it is numbered 1, and returned to the urn otherwise. What is the probability that the second ball drawn is numbered 1?
For a study that consists of personal interviews with participants (rather than mail or phone surveys), explain why simple random sampling might be less practical than some other sampling methods.
Natural Science, 415; Social Science, 511; Business Administration, 619; Philosophy, 196. Create a Pareto chart representing this information.
If a 99% confidence interval is calculated to estimate the difference between the average hourly rates for each type of graduate, what is the margin of error? Assume both population standard deviations are equal.
Determine whether the following equations have a solution or not? Apply the discriminant, are the solutions real, repeated real, or complex?
Twenty students randomly assigned to an experimental group receive an instructional program; 30 in a second group do not. After 6 months, both groups are tested on their knowledge
Find the probabilities that in 1 hour (a) there are between 23 and 26 calls inclusive, (b) more than 30 calls, using the normal approximation to the poisson distribution.
Researchers studying infant head circumferences (in centimeters) wish to test if the mean head circumference differs from the historical mean of 34.5 cm. The researchers obtain a sample of 17 infants with a mean head circumference of 34.16 cm and a s..
Community college spends each year. If she wishes to be 90% confident, how large a sample is necessary if the standard deviation is known to be $80?
A catering service offers 9 appetizers, 8main courses, and 12desserts. A banquet chairperson is to select 8 appetizers, 3main courses, and 4 desserts for a banquet. In how many ways can this be done?.
The percentage rates of home ownership for 8 randomly selected states are listed below. Estimate the population variance and standard deviation for the percentage rate of home ownership with 99% confidence level.
A sociologist is studying the prevalence of crime in one major city. In a sample of 225 randomly selected residents, 60 say that they have been victimized by a criminal.
Construct a 99% confidence interval estimate for the population mean weight of the tea bags. Is the company meeting the requirement set fourth on the label that the mean of tea in a bag is 5.5 grams?
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