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Because the observed data are from operators randomly selected from the population, the variation among operators in the population is referred to as random effects. One-way random effects model : yi j = + i + i j , i j "s are independent error terms with N(0, 2 ), i are independent N(0, 2 ), And i and i j are independent Why?
Suppose the federal government proposes to give a substantial tax break to automakers producing midsize cars that get a mean mileage exceeding 31 mpg.
How to identify the subjects who are closest to the cutoff for the upper 2.5% and 5% of the scores and the lower 2.5% and 5% of the scores when looking at the z-scores?
can we conclude that the mean assembly time for this component exceeds 3 minutes? What error could be made in this case? Describe it in words.
Describe a hypothesis upon which the manufacturer might wish to conduct a test concerning the relative effectiveness of the new fertilizer.
Is there a difference in the mean allowances nationally and the mean allowances in northwestern Ohio for nine-year-olds?
Demonstrates clearly and fully the ability to use Excel to perform the correlation for the data set.
Draw sketch and find the two-readings that are cutoff values separating the rejected thermos from the others. Graph and then note the cut off values.
A four-year university has decided to implement new approach to teaching Statistics. Full-time and adjunct professors were surveyed to determine whether they preferred the traditional lecture approach or a computer approach to teaching Statistics.
Determine whether or not the mean waiting time of all customers is significantly more than 3 minutes.
Assuming the sample size of 40 can be considered as large, compute the confidence interval for a confidence level of 90%.
Estimate the true proportion of college students who believe in the possibilty of haunted places with 99% confidence.
We wish to determine whether the homicide rate is different in different parts of the country and, if it is different, what is the pattern. We have data on 36 states - 9 each in the four regions Northeast, Midwest, South and West.
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