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Andrew plans to retire in 32 years. He plans to invest part of his retirement funds in stocks, so he seeks out information on past returns. He learns that over the entire 20th century, the real (that is, adjusted for inflation) annual returns on U.S. common stocks had mean 8.7% and standard deviation 20.2%. The distribution of annual returns on common stocks is roughly symmetric, so the mean return over even a moderate number of years is close to Normal.
(a) What is the probability (assuming that the past pattern of variation continues) that the mean annual return on common stocks over the next 32 years will exceed 12%?
(b) What is the probability that the mean return will be less than 8%?
Three adults are selected at random without replacement. Find the probability that all three like sugar cereals.
A point Y is selected at random from interval (0,1). Then another point X is chosen at random from the interval (0,Y). Find probability density function for X.
300 randomly selected television viewers were questioned on the main reason they watched particular programs. The results are given below.
Suppose 94 percent of the items have lives exceeding 2000 h and 3.51 percent have lives exceeding 16,240 h. Find the mean and standard deviation of the service life.
there is an issue with treatment side effects individuals with a certain variant of the fictitous cehs gene suffer
The Acme Candy Company claims that 8% of the jawbreakers it produces actually result in a broken jaw. Suppose 9571 Persons are selected at random from those who have eaten a jawbreaker produced at at Acme Candy Company. Would it be unusual for thi..
Carefully sketch a Venn diagram showing the relationship between the events seen in less than 15 minutes and admitted to the hospital, and add probabilities to the appropriate regions.
a very large data set contains aptitude test scores of trainee employees. the population has a mean of 73 and a
Why is Hypothesis testing important? When is Hypothesis testing most useful?
An experiment investigated the release of the hormone ACTH from ratpituitary glands under eight treatments: the factorial combinations of CRF (0 or 100 nM; CRF is believed to increase ACTH release), calcium (0 or 2 mM of CaCl2), and Verapamil (0 o..
Plot a scatter diagram. By looking at the scatter diagram, do you expect the correlation coefficient between these two variables to be close to zero, 1, or - 1
The equation of the least squares regression line was Y = 8 - 2X, where Y represents the LOS in days and X the RN/pt ratio.
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