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A population is knows to have a mean of mu=25 and a variance of var=3. Fifty samples are drawn from the population and sample means calculated for each. What is the variance of these sample means?
Voters. Suppose that in your city 37% of the voters are registered as Democrats, 29% as Republicans, and 11% as members of other parties.
Perform a contingency analysis on the data to determine if there is any dependency between the number of level of education attained by the father and the size of his family.
Perform a chi-square test on the following data:
What would be the estimated total enrollment for an HMO firm that administered 20 plans? Source: The Wall Street Journal Almanac 1999, p. 565.
What are some examples in the popular press of misuse of statistics?
In a random sample of 21 pieces of paper birch, the sample variance in shrinkage was 0.39. Is there any evidence to suggest the population variance in shrinkage is less than 0.50? Assume normality and use a = 0.10.
in a human factor experimental project it has been determined that the reaction time of a pilot to a visual stimulus is
A pizza restaurant manager claims that the average home delivery time for their pizza is no more than 20 minutes.
Construct a 95% confidence interval estimate of the mean SAT scores. Show all work. Just the answer, without supporting work, will receive no credit.
Compute a 95% confidence interval for the population mean, based on the sample 1, 2, 3, 4, 5, 6, and 30. Change the number from 30 to 10 and recalculate the confidence interval.
You are asked by the owner of the Starshine Motel to develop a customer satisfaction survey to determine the percentage of customers who are dissatisfied with service.
At a certain construction site, the probability of an accident on any given day is 0.005, and the accidents that occur are independent of each other. What is the probability that, in any given period of 40 days, there will be an accident on one da..
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