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A researcher is interested in estimating the average salary of police officers in a large city. She wants to be 99% confident that her estimate is correct. If the standard deviation is $1050, how large a sample is needed to get the desired information and to be accurate within $200?
Does the regression equation account for a significant portion of the variance in the cognitive scores? Use a=.05 to evaluate the F-ratio.
an engine additive is being tested to see whether it can effectively increase gas mileage for a number of vehicles.
Utilize this information to construct a probability table, and then calculate each of the given probabilities:P (female and domestic car).
What is the 95% confidence interval for the true mean length of the bolt? Assume a normal population distribution.
The mean salary of the nine employees of a small business is $52,000 per year. One employee, whose salary was $68,000, was red. Two new employees, who will each be paid a salary of $40,000, are hired. What is the new mean annual salary of the emp..
a pair of dice is rolled 5 times. find the probability that a total of 11 occurs twice before a total of 5
testing for population mean.atms must be stocked with enough cash to satisfy customers making withdrawals over an
Statistical Hypothesis testing - Frequency distribution
A popular snack is packed by machine into 9-ounce boxes. The distribution of box weights is normally distributed with a mean of 9 ounces and a variance of 0.01 ounces. What is the probability of randomly selecting a box containing less than 8.9 ou..
how do i find fisher information matrix of n iid random variables x1... xn of a gamma distribution with parameter alpha
Each day the major stock markets have a group of leading gainers in price (stocks that go up the most). On one day the standard deviation in the percent change for a sample of 10 NASDAQ leading gainers was 15.8.
the number of power outages at a nuclear power plant has poisson distribution with a mean of 0.8 outage per month. what
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