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According to Investment Digest ("Diversification and the Risk/Reward Relationship", Winter 1994, 1-3), the mean of the annual return for common stocks from 1926 to 1992 was 16.5%, and the standard deviation of the annual return was 19%.
a. What is the probability that the stock returns are greater than 0%?
b. What is the probability that the stock returns are less than 18%?
Kids again. Find the standard deviation of the number of children the couple in Exercise may have.
in an experiment to learn if substance m can help restore memory the brains of 20 rats were treated to damage their
a consumer advocate wants to find out if motivational speakers can actually improve peoples earning power. he randomly
The impact of three different advertising techniques is being studied by a marketing firm.- Can we conclude that the advertising technique has an impact on sales? Use α= 0.10. What is the p-value?
If each task is analyzed separately as the researchers did in their report, what is the appropriate statistical method to use? Explain your answer.
Previously, it was shown that if X and Y are independent random variables, then τ (8.2) has a value of 0. Show that the converse is not true by constructing a joint probability distribution for the pair of random variables X and Y such that τ = 0 ..
Assume the body temperatures of healthy adults are normally distributed with a mean of 98.20°F and a standard deviation of 0.62°F (based on data from the University of Maryland researchers).
Problem: What is the 95% confidence interval for the following stock? It has an E(R) of 18% and STD DEV of 23%
Which of the following is the most appropriate conclusion given this finding?
If the test is positive, what is the probability that this person actually has heart disease?
Is there any evidence to suggest the population variance in height is greater than the company's desired value? Assume normality and use a = 0.01.
For the American Express example, give a 95% prediction interval for the amount charged by a member who traveled 5,000 miles. Compare the result with the one for x = 4,000 miles.
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