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In a random sample of five microwave ovens, the mean repair was $80.00 and the standard deviation was $11.50. Assume the variable is normally distributed and use a t-distribution to construct a 99%
In 1894,druggist Asa Candler began distributing handwritten tickets to his customers for free glasses of Coca-Cola at his soda fountain. By 1975 it was estimated that 65% of U.S. Consumers regularly
Compute the Pearson correlation for the following set of scores:
If the variance for the difference scores is reduced to s2 = 64, are the results sufficient to conclude that there is significant improvement? Use a one-tailed test with a = .05.
A sample of n = 9 has a mean of M = 72 with SS = 162. Use the sample to make a point estimate of u and to construct the 90% confidence interval for mue.
The following data are from an independent-measures experiment comparing two treatment conditions. Do these data indicate a significant difference between the treatments at the .05 level of signific
Do the sample data support the conclusion that the Memory Booster has a significant effect? Test with a = .05. Compute Cohen's d to measure the size of the treatment effect.
For the chi-square test for goodness of fit, what is the value of df for a test with four categories and a sample of n = 100?
A repeated-measures study finds a mean difference of MD = 5 points between two treatment conditions. Which of the following sample characteristics is most likely to produce a significant t statistic
A sample of n = 25 individuals is selected from a population with fx = 80 and a treatment is administered to the sample. If the treatment has no effect, then
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.