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For the horseshoe crab data with width, color, and spine as predictors, suppose you start a backward elimination process with the most complex model possible. Denoted by C ∗ S ∗ W, it uses main effects for each term as well as the three two-factor interactions and the three-factor interaction. Table 5.9 shows the fit for this model and various simpler models.a. Conduct a likelihood-ratio test comparing this model to the simpler model that removes the three-factor interaction term but has all the two-factor interactions. Does this suggest that the three-factor term can be removed from the model? b. At the next stage, if we were to drop one term, explain why we would select model C ∗ S + C ∗ W. c. For the model at this stage, comparing to the model S + C ∗ W results in an increased deviance of 8.0 on df = 6 (P = 0.24); comparing to the model W + C ∗ S has an increased deviance of 3.9 on df = 3 (P = 0.27). Which term would you take out?
d. Finally, compare the working model at this stage to the main-effects model C + S + W. Is it permissible to simplify to this model? e. Of the models shown in the table, which is preferred according to the AIC?
Estimate the linear regression line. Using the data given in the taxicab company problem (the above problem) compute R2, interpret its meaning.
Allen Abbott has a wide-curving, uphill driveway leading to his garage. When ther is a heavy snow, Allen hires a local carpenter, who shovels snow on the side in teh winter, to shovel his driveway.
using one mean z test to test whether or not to support the claim.the stats teacher believes the actual average amount
An engineer in an automotive factory wishes to know what the tire pressure is on all cars leaving the factory. She measures the tire pressure on a sample of 10 randomly selected cars as they are about to leave the plant, in psi.
Given following financing project being considered by venture film, determine critical path probability of completion by 17 weeks.
a coal company wants to determine a 95 confidence interval estimate for the average daily tonnage of coal that they
A random sample of 100 voters found that 44% were goint to vote for a certain candidate. Find the 99% limit for the population proportion of voters who will vote for that candidate.
Estimate the mean number of cars per household for the population of households in the neighborhood. Give the 95% confidence interval.
Someone tells you that 50% of the tickets in the box show positive numbers. Do you believe it? Answer yes or no, and explain.
You just started a job for a mid-size company. The company is very employee-oriented and likes to have employees get involved with making decisions that help improve employee well-being.
the number of vehicles arriving at a toll booth per minute were observed as0 3 1 2 0 1 1 1 2 0 1 4 3 1 1 0 0 1 0 2 2 0
given that fz 1radic2pie-z22 -infin lt z lt infin is the probability density function for the standard normal random
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