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In the oil industry, water that mixes with crude oil during production and transportation must be
removed. Chemists have found that the oil can be extracted from the water /oil mix electrically. Researchers at the University of Bergen (Norway) conducted a series of experiments to study the factors that influence the voltage (y) required to separate the water from the oil (Journal of Colloid and Interface Science, Aug. 1995). The seven independent variables investigated in the study are listed in the table above. (Each variable was measured at two levels-a "low" level and a "high" level.) Sixteen water/oil mixtures were prepared using different combinations of the independent variables; then each emulsion was exposed to a high electric field. In addition, three mixtures were tested when all independent variables were set to 0. The data for all 19 experiments are also given in the table.
a. Propose a first-order model for y as a function of all seven independent variables.
b. Use a statistical software package to fit the model to the data in the table.
c. Fully interpret the ß estimates.
How does the role of power influence the collaborative or competitive nature of an organization? Do you think that leadership consciously chooses one over the other? What are the effects of choosing one over the other?
a random sample of stat200 weekly study times in hours is as follows 4nbspnbsp 14nbspnbsp 15nbspnbsp 17nbspnbsp 20a.
Adult US women are known to have cholesterol levels that are N(189 mg/dL, 25 mg/dL). What % of US women would you expect to have cholesterol levels below 135?
Determine the probability that a randomly selected teacher earns more than $525 per week?
A person claims to be able to predict the outcome of flipping a coin. This person is correct 16/25 times. Compute the 95% confidence interval on the proportion of times this person can predict coin flips correctly.
Change the last number in that set from 36 to 14 and recalculate the confidence interval. Using the results, describe the effect of an outlier or extreme value on the confidence interval.
The mean amount purchased by a typical customer at Churchill\'s Grocery Store is $23.50 with a standard deviation of $5.00. Assume the distribution of amounts purchased follows the normal distribution. For a sample of 50 customers, answer the foll..
A company produces and sells four grades of industrial solvents - A, B, C, and D.The selling price per gallon of each grade of solventis $6.40, $5.00, $4.20, and $3.50 respectively.
The alternative hypothesis is true. In this case the consumer advocacy group will have, A consumer advocacy group doubts this claim and tests the hypotheses
h-p is said to be the leading seller of pc's in the U.S WITH 27% share of the pc market. if a researcher selects 130 recent pc purchases
if you are using the method of least squares for fitting trends in an annual time series containing 25 consecutive
instructions perform the 5-step hypothesis testing procedurehere are the steps that need to be followed amp the raw
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