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About 72% of dog owners buy holiday presents for their dogs. Suppose n = 4 dog owners are randomly selected. Find the expected number of persons, in the sample, who buy their dog holiday presents.
In a random sample of 150 sports cars, 60 failed emissions on the first pass. Is there sufficient evidence to indicate that the percentage of first failure for sports cars is higher than the percentage for all passenger cars?
The process of using sample statistics to draw conclusion about the true population parameters is called:
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
The United States Postal Service reports that 95 percent of first class mail within the same city is delivered within two days of the time of mailing. Six of the letters are randomly sent to different locations.
Carry out a test of hypothesis on each of regression coefficients. Could you delete any of the variables?
Compute the Pearson correlation. Multiply each X value by 2 and compute the Pearson correlation for the modified scores.
A frequency polygon: does not depend on one variable. True-False
Suppose that population has normal distribution. Determine a 95 percent confidence interval for population standard deviation sigma.
An orange juice producer buys only one kind of oranges. The amount of juice squeezed from each of these oranges is approximately normally distributed with a mean of 4.2 ounces and a population standard deviation of 1 ounce.
Is there evidence to suggest that the training course helps out sales people?
Compute the coefficient of multiple determinations.
Assume that increasing and decreasing allergic reactions are equally likely if the training has no effect. Use alpha = .05
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