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You want to conduct a poll to see what kind of mileage a new model of pickup gets. You wish to be 95% confident and have an error of 0.4 mpg. The standard deviation is estimated at 1.8. How big must the sample be?
Statistics and Probability, Statistics
A copier services company is considering adding an advanced model to its product line but is concerned about excessive maintenance calls. During a trial introduction in a test market, maintenance personnel recorded X, th ...
Let X be the random variable that represents the life in hours of a certain electronic device. The probability density function of X X is f(x)=360x 3 f(x)=360x3 , 10≤x≤15 10≤x≤15. Find the expected life of this device.
Suppose that, for a given patient, the true EF is 63. Consider the population of EF values that can be estimated on that patient using option II above. That population follows a normal distribution with μ= 63. Find the p ...
A random group of 20 depressive patients has been given the MMPI. Their scores on a depression scale are as follows: 30 45 32 28 33 25 37 32 34 32 26 35 30 34 35 31 36 26 42 39 Construct a frequency distribution. Then ma ...
1. A stock market analyst is able to identify mis-priced stocks by comparing the average price for the last 10 days to the average price for the last 60 days. If this is true, what do you know about the market's efficien ...
In order to fund her retirement, Helen needs her portfolio to have an expected return of 13.8 percent per year over the next 30 years. She has decided to invest in Stocks 1, 2, and 3, with 25 percent in Stock 1, 50 perce ...
A sample of 100 people is classified by gender (male/female) and by whether they are registered voters. The sample consists of 80 females and 20 males, and has a total of 60 registered voters. If these data are used for ...
A professor teaches two statistics classes. The morning class has 25 students and their average on the first test was 82. The evening class has 15 students and their average on the same test was 74. What is the average o ...
How much of the opposing side should you share in a presentation to a multiple-perspective audience, and what techniques would you use?
What is the probability that a randomly selected person will have a birthday in November? Assume that this person was not born in a leap year. Express your answer as a simplified fraction or a decimal rounded to four dec ...
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Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate
Describe the difference between zero coupon bonds and coupon bonds. Under what conditions will a coupon bond sell at a p
Compute the present value of an annuity of $ 880 per year for 16 years, given a discount rate of 6 percent per annum. As
Compute the present value of an $1,150 payment made in ten years when the discount rate is 12 percent. (Do not round int
Compute the present value of an annuity of $ 699 per year for 19 years, given a discount rate of 6 percent per annum. As