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Describe how you will design a study that will optimize sensitivity, specificity, and predictive value and minimize Type I and II errors.
Which of the following would cause a change in a feasible region? Removing a redundant constraint
A researcher testing the effects of two treatments for anxiety computed a 95% confidence interval for the difference between the mean of treatment 1 and the mean of treatment 2. If this confidence i
An article contained the following observations on degree of polymerization for paper specimens for which viscosity times concentration fell in a certain middle range:
Suppose the lifetime of a particular appliance follows an exponential distribution with a mean of 10 years. What is the probability that the appliance will fail in less than 5 years?
Assume that there are 400 undergraduates in the College of Business. 35 students are taking a Data Mining class and 300 students are taking QMB3600. 85 students are taking neither QMB3600 nor Data M
Suppose that you are a researcher testing a new drug that might cure AIDS. In making a decision about whether to recommend this drug for use, you test the null hypothesis that the drug is not effect
Describe the Type I and Type II errors with your study. What are the ramifications of making these errors (from a clinical perspective)?
An independent-measures research study uses two samples, each with n = 12 participants. If the data produce a t statistic of t = 2.50, then which of the following is the correct decision for a two-t
The table below contains profit projections for various decisions to be made by the University. The associated probabilities for the states of nature are .40 for high demand, .35 for medium demand;
A researcher wants to compare how college graduates and college drop-outs feel about the legalization of marijuana. She asks whether they strongly support, moderately support, or don't support lega
The production available in each department each month, and the minimum monthly production requirement to fulfill the contracts, are as follows:
If 70 percent of the population of a large community is in favor of a proposed rise in school taxes, using the normal approximation to the binomial distribution, approximate the probability that a r
Calculate the estimate from the following n = 10 observations on vibratory stress of a turbine blade under specified conditions. (Round your answer to three decimal places.)
Let the experiment be the toss of three dice in a row.
Suppose many samples of size 49 are selected from a population with a mean = 225 and a standard deviation = 14. What distribution shape would you expect for your x-bar's? Why?
The area under the density curve that lies to the right of 12 is 0.405. What percentage of all possible observations of the variable are at most 12?
An airline has classified its customers as high-volume travelers (assumed to be business travelers) or low-volume travelers (assumed to be leisure travelers). Eight-five (85) percent are high volume
Your firm has 4 different manufacturing lines that each produce the same type of widget. There is a 95 percent chance that each line is functional on any given day. Assuming a Bernoulli process wha
Calculate the percentage of variance accounted for (r^2) to measure the effect size for an 8-point mean difference and for a 12-point mean difference.
What is the mean of the binomial distribution? What is the variance of the binomial distribution? What is the standard deviation of the binomial distribution?
Let X be a negative random variable with parameter r, p. Prove that E(X) = r/p by expressing X as a sum of indicator random variables.
A random sample of 15 teachers from Rhode Island has an average salary of $35,270, with a standard deviation of $3,256. A random sample of 30 teachers from New York has an average salary of $29,512,
You conducted a t-test in your capstone research. You did not find a statistically significant difference between your groups even though your sample size was relatively small. Upon conducting a pos