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Question: Groundwater contamination in wells. In New Hampshire, about half the counties mandate the use of reformulated gasoline. This has lead to an increase in the contamination of groundwater with methyl tert-butyl ether (MTBE). Environmental Science and Technology (January 2005) reported on the factors related to MTBE contamination in public and private New Hampshire wells. Data were collected for a sample of 223 wells and saved in the MTBE file. (Selected observations are listed in the table at the bottom of p. 343.) The list of potential predictors of MTBE level (micrograms per liter) include well class (public or private), aquifer (bedrock or unconsolidated), pH level (standard units), well depth (meters), amount of dissolved oxygen (milligrams per liter), distance from well to nearest fuel source (meters), and percentage of adjacent land allocated to industry. Apply a variable screening method to the data to find a small subset of the independent variables that are the best predictors of MTBE level.
Create a scenario where the binomial probability formula could be used to determine the probability of some number of successes, x, in some given number of trials,n.
A large school district is re-evaluating its teacher's salaries. They have decided to use regression analysis to predict mean teacher salaries at each elementary school. What is the correlation coefficient
This sample for the proportion of the population that would favor a recount. What is the Point Estimate for the proportion of the population that would favor a recount?
A model of an automobile driver attempting to steer a course is shown in Figure P9.18, where K = 5.3. (a) Find the frequency response and the gain and phase margins when the reaction time T is zero,
If the sum of the squared deviations about the regression line is SSE = 40.0, what is the coefficient of determination?
In 2007, the combined scores of the millions of college-bound seniors taking the SATs were approximately Normal with mean 1017 and standard deviation.
The January 17, 1994 issue of Time magazine reported that 58% of adult Americans said yes to the question "If you or your spouse were pregnant, would you want the unborn child tested for genetic defects?"
What is the probability that the next household on the list will be contacted but will refuse to cooperate?
Construct the network for this project and determine the activity schedule. Identify critical path and determine the expected project duration time and variance. What is the probability that the program can be completed within 4 months?
1. suppose a 95 confidence interval is computed for u resulting in the interval 112.4 121.6. then it would be accurate
Suppose that a person searches through leaves on a tree until he finds one with at least two eggs. Letting X = the number of leaves searched, what is the expected value and variance of X?
could mud-wrestling be the cause of a rash contracted by university of washington students in the spring of 1992? two
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