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1. Despite any problems it might have, summarize how you would justify using Student's t-test to compare two independent groups.
2. Summarize any practical concerns about Student's t-test and comment on how they might be addressed.
Statistics and Probability, Statistics
According to a study in a previous year, 57.0% of households nationwide used natural gas for heating during a year. Recently, a survey of 2,700 randomly selected households showed that 58.0% used natural gas. Use a 0.05 ...
What percent of the measurements are found below the 30th percentile? Found above the 30th percentile? For the regression line y^ = 3x + 2 what is the best predicted value if x is 7? Assume that male and female births ar ...
Assume that the box contains 12 balls: 4 red, 4 green, and 4 blue. Two balls are drawn at random, one after the other without replacement. What is the probability that the first ball was blue, given that the second was r ...
A company employs eight people and plans to select a group of five of these employees to receive advanced training. How many ways can the group of five employees be selected?
Assume that showing a car is a Bernoulli trial, and each time she shows a car, there is a probability of 0.15 that the customer will buy the car. The saleswoman has a goal of selling at least one car a week. 1) How many ...
A stock price is currently $112. Stock price move up by 10% or down by 14%. The risk-free interest rate is APR 2% with continuous compounding. What is the value of a six-month European put option with a strike price of $ ...
Consider projects A and B with the following cash flows: C0 C1 C2 C3 A -$29 $18 $18 B -$54 29 29 What is the profitability index of each project? (Do not round intermediate calculations. Round your answers to 2 decimal ...
The equation used to predict how long a cold will last is y=-1.8 + 0.09x1 + 3.2x2 - 1.9x3, where x1 is person's temperature on the first day, x2 is number of people seen each day, and x3 is the amount of sleep the person ...
How would I calculate this: Anystate Auto Insurance Company took a random sample of 382 insurance claims paid out during a 1-year period. The average claim paid was $1590. Assume σ = $234. Find a 0.90 confidence interv ...
Why has LIBOR played such a central role in international business and financial contracts? Why has this been questioned in recent debates over its value reported?
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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