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The author of an entry-level book on using Microsoft Word has carried out a test in which 35 novices were provided with the book, a computer, and the assignment of converting a complex handwritten document with text and tables into a Microsoft Word file. The novices required an average time of 105 minutes, with a standard deviation of 20 minutes. Construct and interpret the 90% confidence interval for the population mean time it would take all such novices to complete this task.
refer to the 2010 data which report information on the 30 major league baseball teams for 2010 season.a. conduct a test
Exponential distribution with a mean of 4 minutes. What is the probability that a person is served in less than 3 minutes on at least 4 of the next 6 days.
Random samples of five hundred units that were selected daily from a manufacturing process produced an overall defective rate of 3.5%. Calculate the lower and upper control limits for a percentage control chart.
a tool-crib with one attendant serves a group of 10 mechanics. mechanics work for an exponentially distributed amount
In a recent year grade 8 Washington State public school students taking a mathematics assessment test had a mean score of 276.1 with a standard deviation of 34.4. Possible test scores could range from 0 to 500. Assume that the scores are normally dis..
two electronic components of a missile system work in harmony for the success of the total system. let x and y denote
How many women must be randomly selected to estimate the mean weight of women in one age group. We want 90% confidence that the sample mean is within 3.7 lb of the population mean.
A professor is targeting a score of 80 on an exam. His forty-nine students averaged 78 on an exam with s = 7. Are the scores significantly less than 80 at a significance level of 0.05? Show your work and state the conclusion.
Determine and interpret the p-value for the test. Source: Bureau of the Census, Statistical Abstract of the United States 2009, p. 163.
A random sample of 36 cars showed a mean repair cost of $330, with a standard deviation of $120. What can you tell the city fathers?
Consider the two-bidder two-object uniform-price auction. Suppose the distribution is uniform on [0, 1] and that c'(x) > 0 for every x. Show that (x, c(x)) is a symmetric equilibrium when α2 = 2.
State the null hypothesis and the alternative hypothesis that we would use for this test.
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