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What happens when you square a random variable?
Let X be a continuous random variable with p.d.f fX, and let Y=X^2
Show that:
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A statistics profressor plans classes so carefully that the lengths of her classes are uniformly distributed between 50.0 and 60.0 minutes. Find the probability that a given class period runs great than 50.5 minutes.
Fittinga straight line to a set of data yields the following prediction line- yi= 2 + 5Xi
Suppose 1.5 percent of the antennas on new Nokia cell phones are defective. For a random sample of 10 antennas, find the probability that:
facebook reports that the average number of facebook friends worldwide is 175.5 with a standard deviation of 90.57.
What is the difference between the R and R-squared terms? What does each tell you? How large should the R-squared term be if you want to show that the two variables are practically related?
One item on a questionnaire asks, "How many siblings (brothers and sisters) did you have when you were a child?" A researcher computes the mean, the median, and the mode for a set.
the following probability model shows the distribution of doctoral degrees from u.s. universities in 2009 by area of
Develop a regression model that would predict the DJIA based on the S&P 500 index. Based on this model, what would you expect the DJIA to be when the S&P is 1,100? What is the correlation coefficient (r) between the twomarkets?
the liquid chlorine added to swimming pools to combat algae has a relatively short shelf life before it loses its
Suppose that scores on a particular test are normally distributed with a mean of 130 and a standard deviation of 19. What is the minimum score needed to be in the top 5% of the scores on the test?
Contruct a confidence interval for the proportion of non-fatal accidents that involved a cell phone at a 95% confidence interval.
what is the probability that ms. a mr. b and mrs. c win the rst second and third prizes respectively in a drawing if
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