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A special test is given to people complaining of sever headaches. if someone has a brain tumor, the test is positive with a probability of .8 (80%). if they have no tumor, the test is positive with a probability of .1 (10%). only 4% (.04) of those tested actually have brain tumors. what is the probability of someone who tested positive has a brain tumor
Estimate and interpret the p-value of the calculated test statistic.
Does the regression equation account for a significant portion of the variance in the cognitive scores? Use a=.05 to evaluate the F-ratio.
Ohio Company provided the following information regarding its only product--ice skates.
The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, and 10.
The average price of a sample of 12 bottles of diet salad dressing taken from different stores is $1.43. The standard deviation is $0.09. The average price of a sample of 16 low-calorie frozen desserts is $1.03.
From a practical point of view, what is the difference between the frequency distribution and relative frequency distribution? Why is a cumulative relative frequency distribution so much more informative that just the relative frequency distributi..
Are the following statements a valid pair of null and alternative hypothesis?
Calculate descriptive statistics for each stock and the S&P 500. Comment on your results. Which stocks are the most volatile? Calculate the value of beta for each stock.
Relatively speaking, who performed better on the test, you, with an 86, or your friend? Why?
Suppose that the mean of the annual return for common stocks from 2000 to 2012 was 8.5%, and the standard deviation of the annual return was 25.2%.
Develop three regression models to predict the selling price based upon each of the other factors individually. Which of these is best?
If he finds differences, then he may realize that, 1) he will need to evaluate his course ethnic sensitivity,
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