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Select three students from a class to receive ice cream by putting all the students' names in a hat ad picking out three names randomly. Is it a observational study, sample survey or an experiment ? Why?
Statistics and Probability, Statistics
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Researchers at the University of Pennsylvania School of Medicine have determined that children under 2 years old who sleep with the lights on have a 35% chance of becoming myopic before they are 16. Children who sleep in ...
Let's pretend that in a hospital, 7% of patients are "high-risk" while the others are "lower-risk". For patients that are high-risk, 75% will be re-admitted within 30 days. For "lower-risk" patients, the 30day re-admitta ...
Let X be a random variable with range RX = {-1, 0, 1} and let P(X = 1) = P(X = -1) = p/2 for some p ∈ [0, 1]. a) Compute P(X = 0). b) Compute the expectation E[X] and variance Var(X) of X as a function of p, and determin ...
You invested $7,900 one year ago. Today it is worth $8,654.90. What annual rate of interest did you earn? [use annual compounding]
In the Health ABC Study, 522 subjects owned a pet and 1968 subjects did not. Among the pet owners, there were 297 women; 961 of the non-pet owners were women. Find the proportion of pet owners who were women. Do the same ...
Suppose you just purchased a digital music player and have put 9 tracks on it. After listening to them you decide that you like of the songs. With the random feature on your? player, each of the 9 songs is played once in ...
1. What is the YTM for a 14-year semi-annual bond that pays $35 every six months and has a purchase price of $980.000? Face value is $1,000. 2. A person wants to put aside $500 at the beginning of each month for 10 years ...
An automobile accidents occur over a 72 hour holiday period are like events in a poisson process with = 10 per hour. Let Y be the time for the first accident. a) What is the mean of Y and variance of Y? b) Find P(Y > 15 ...
How much of the opposing side should you share in a presentation to a multiple-perspective audience, and what techniques would you use?
A company recently had 26 million shares outstanding trading at $45/share. The company announces its intention to raise $290M by selling new shares. What price shoukd the company expect its existing shares shares to sell ...
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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