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1. What is confounding of variables?
2. What is meant by the internal validity of an experiment?
3. How do the two true experimental designs eliminate the problem of selection differences?
Statistics and Probability, Statistics
A study shows that 81% of the population of all calculus students consider calculus an exciting subject. Suppose 34 students are independently selected from the population. If the true percentage is really 81%, find the ...
A confidence interval for a population mean is to be estimated. The population standard deviation is guessed to be anywhere from 14 to 24. The half-width B desired could be anywhere from 2 to 7. Tabulate the minimum samp ...
You are working with a MOE of +/-4% and a confidence level of 95%. P and Q =.50, and your CPI is $25.00. The company you work for needs to make a decision as to whether they may need different advertising for men and wom ...
The table below shows the results of a survey that asked 2873 people whether they are involved in any type of charity work. A person is selected random from the sample. Frequently Occasionally Not at All Total Male 225 4 ...
A puck company wants to sponsor the players with the 10% quickest goals in hockey games. The times of first goals are normally distributed with a mean of 8.54 minutes and a standard deviation of 4.91 minutes. How fast wo ...
You are working for a large corporation and oversee a marketing research project. For this study, your questionnaire length is 10 minutes and the incidence is 35%, yielding a CPI is $23.00. Your company requires all rese ...
a) Using an hp 12c calculator, what are the correct steps to calculate IRR entered as monthly payments and if summed up for a year? b) Using an hp 12c calculator, what is the best way to calculate effective interest rate ...
A manufacturer obtains? clock-radios from three different? subcontractors: 10?% from? A, 30?% from? B, and 60?% from C. The defective rates for these subcontractors are 3?%, 2 %, and 5?% respectively. If a defective? clo ...
Q1. What would the best approach to evaluating whether the extension to the new line be? would an IRR / NPV approach be adequate? Q2. My understanding is that we would take the sales of the extension of the modern line ( ...
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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