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Predicting the total amount of PCB. Use the four congeners, PCB52, PCB118, PCB138, and PCB180, in a multiple regression to predict PCB.
(a) Write the statistical model for this analysis. Include all assumptions.
(b) Run the regression and summarize the results.
(c) Examine the residuals. Do they appear to be approximately Normal? When you plot them versus each of the explanatory variables, are any patterns evident?
oil field pipes are internally coated in order to prevent corrosion. researchers at the university of louisiana
Do the independent variables correlate statistically significantly and practically with the dependent variable?
A medium-sized business operates a small fleet of vehicles. The existing practice is to allocate to each driver a particular area. This area then becomes their ‘patch'. The drivers undertake all the deliveries in their area and only help out in ot..
The lifetime of zzz batteries are normally distributed with a mean of 270 hours and a standard deviation of 10n hours. Find the number of hours that represent the 40 th percentile.
Draw a picture of the appropriate sampling distribution, and show where the value x‾1 - x‾2 = 2 falls on it.- Find the value of the standardized statistic corresponding to x‾1 - x‾2 = 2.
Real estate, part 2. In the real estate research described in Exercise 29, 64% of homes for sale have garages, 21% have swimming pools, and 17% have both features. a) What is the probability that a home for sale has a garage, but not a pool?
show that the distribution of a random variable x with possible values 0 1 and 2 is determined by -li ex and -l2 ex2
Let A be an M x N matrix and X an N x 1 matrix. (a) How many multiplications are needed to calculate AX?
Testing for population mean - What happens as you use different levels of significance? Different values of the standard deviation?
Let Yi Y2 ··· Y48 be the order statistics of a random sample of size 48 from a distribution of the continuous type. We want to use the observed interval (y4 , y45 ) as a lOOy percent tolerance interval for 75 percent of the distribution.
scores on a certain intelligence test for children between ages 13 and 15 years are approximately normally distributed
If an auction house is selling products to risk neutral buyers, which of the types of auction would you recommend? If you are a potential buyer, what might your strategy be? Support your answers using economic analysis learned in this course.
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