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Describe a fictional two-group experiment that could be tested with an independent t-test but violates the assumption required for homogeneity of variance. Explain what the researcher could have done to avoid this problem
Statistics and Probability, Statistics
Which of the following techniques could we use to evaluate the effect of sales at one coffee shop versus sales at another coffee shop, so see if the two shops might be cannibalizing business from one another?
The number of people arriving for treatment at an emergency room can be modeled by a Poisson process with a mean of 7 people per hour. How many people do you expect to arrive during a 55-minute period?
A random sample of the closing stock prices in dollars for a company in a recent year is listed below. Assume that sigma σ is ?$2.59. Construct the 90?% and 99?% confidence intervals for the population mean. Interpret th ...
Many Raleigh, north Carolinian's owns one or more TVs. Below is a distribution of the number of TVs per house hold in Raleigh. Fill in the missing probability to make a valid discrete probability distribution or explain ...
A die is rolled four times. What is the probability that the sum of four numbers equals 13?
I. A statistics instructor wants to measure the effectiveness of his teaching skills in a class of 66 students ( N = 66). He selects students by waiting at the door to the classroom prior to his lecture and pulling asid ...
Let X be a normally distributed random variable with μ = 100 and σ = 10. Find the probability that X is between 80 and 105. (Round your answer to the nearest whole number percent and include the percent symbol.)
Your supervisor comes to you and says she would like a marketing research study. She says there is a budget of $30,000. She would like to conduct a simple random sample of consumers interested in using the services of th ...
You ask your roommate to mail a letter for you. Suppose there is a 0.21 probability your roommate will forget to mail it. Should your roommate mail your letter, there is a 0.9 probability that Canada Post will deliver t ...
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 ...
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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