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A researcher has a report for an experiment with a sample size equal to 100, the resulting 95% prediction interval was too large. If the researcher wishes to run a more precise experiment that will result in a 95% prediction interval half the size of the earlier study, then the researcher will require what size of a sample?
A better case can be made that observation 13 (Los Arboles) is an outlier. Describe what this means in plain terms.
Sample standard deviation s2 = 7.6 thousand dollars. Does this indicate that in St. Louis, computer stores tend to have higher mean profits per employee? Use α = 0.01 and interpret your answer.
He asks you to develop a proposal for the study and submit it to him. Develop the management-research question hierarchy that will help you to develop a specific proposal.
Differentiate both sides of the equation from part (a) with respect to x to obtain:
Find the probability that on a given shift: (1) Exactly 2 workers will be absent; (2) More than 4 workers will be absent. [Given that e to the power of -3 is equal to 0.04979]
We are interested in a 95% confidence interval for the population mean score. The margin of error associated with the confidence interval is?
How many subjects are needed to estimate the number of books read the previous year within one book with 99% confidence?
Explain the difference between the null hypothesis and the alternate hypothesis. How is the null hypothesis chosen (why is it null)? What is the importance of rejecting the null hypothesis, can we make a geneeral staement about the population base..
Supposes that the diameter of bearings are independent normally distributed random variables with mean µB = 1.005cm and variance σ²B = (0.003)² cm² . The diameter of shafts are independent normally distributed random variables having mean µB = 0.9..
Conduct a hypothesis test using H 0 : σ 2 = .009216 to see whether the sample data indicate that the variability in interest rates changed.
the average math sat score for males was 519 with a standard deviation of 105. for females avg math score was 484 with
Assume the following summary statistics, which describe the speed of a computer processor, are available from a sample of Intel Pentium IV chips manufactured at the company's Arizona chip plant (values are in Megahertz):
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