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The annual rate of return on stock indexes (which combine man individual stocks) is approximately normal. Since 1945, the Standard & Poor's 500 Index has had a mean yearly return of 13%, with a standard deviation of 19.5%. Take this normal distribution to be the distribution of yearly returns over a long period.
(a) In what range do the middle 95% of all yearly returns lie?
(b) The market is down for the year if the return on the index is less than -1.24%. In what proportion of years is the market down?
(c) In what proportion of years does the index gain 28.41% or more?
Given that the necessary assumptions are satisfied, can it be concluded, at the 2.5% level of significance, that not all mean times to relieve pain are equal? Formulate and test the appropriate hypotheses. Use the critical value approach
suppose x has density function x2 for 0 lt x lt 2 and 0 otherwise. find the density function of y x2 - x by computing
1 the probability of a successful optical alignment in the assembly of an optical data storage product is p 0.6.
The speed with which utility companies can resolve problems is very important. GTC, the Georgetown Telephone Company, reports they can resolve customer problems the same day they are reported in 70 percent of the cases.
According to data, a particular brand of cigarettes contain an average of1.8milligrams of nicotine. An advocacy group commissions an independent test to see if the mean nicotine content is higher than the industry laboratory claims.(a) What areH0a..
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Draw a box plot for the data in given problem. Are there any outliers? Is the distribution of the data symmetric or skewed? If it is skewed, to what side?
What is the probability that no more than two of the three are commercial successes?
A real estate agent has 2 tours. The first tour through N1and has 10 homes for sale, whereas the second tour through N2and has 5 homes for sale.
A customer of the retailer bought it for $24. What was the markup on selling price for each member of this product's channel of distribution?
the 70-year long-term record for weather shows that for new york state the annual precipitation has a mean of 39.81
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