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Bbody weights are normally distributed with a mean of 152 pounds and a standard deviation of 26 pounds. How many people must be surveyed if we want to estimate the percentage who weigh more than 180 pounds? Assume that we want 96% confidence that the error is no more than 2 percentage points.
A jar contains 2 black marbles and 8 white marbles. If you randomly pick 2 marbles without replacement, what is the probability that you get one marble of each color?
Complete the simulation Applying Time Series Methodologies located on . During the third cycle of the simulation, you will need to make a decision regarding sales forecasts for Blues Inc.
A pie chart shows the market shares of cola products. The "slice" for Pepsi-Cola has a central angle of 90 degrees. What is its market share.
An aptitude test is designed to measure leadership abilities of the test subjects. Suppose that the scores on the test are normally distributed with a mean of 580 and a standard deviation of 120.
What is the probability of selecting a credit card customer at random and finding the customer charged between $70 and $83? compute the probability of charges less than $54.
The samples do indicate that university A's students are younger than university B's; but is the difference significant at the 1% level?
Place a 95% confidence interval about the population mean number of down hours per month.
Determine the number of successes suggested by the given statement.
Divide your data in half, your first 8 observations and your last 7 observations. Then use ANOVA to test to see if there is a significant difference between the two halves of your data. This list of Webpages that Perform Statistical Calculations h..
Illustrate what is the probability all four calls are infact emergencies. Illustrate what is the probability that three or more calls are not emergencies.
Acme plumbing supply just received a shipment of 5,000 stainless steel valves, but 50 regular steel valves were also sent. There is no way to tell the difference between the valves.
Random sample of 64 lightbulbs indicates a sample mean life of 350 hours. At a 5% level of significance, is the mean life more than 375. Which of the following is your two hypotheses?
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