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The U.S. Department of Agriculture has developed and adopted the Universal Soil Loss Equation (USLE) for predicting water erosion of soils. In geographical areas where runoff from melting snow is common, the USLE requires an accurate estimate of snowmelt runoff erosion. An article in the Journal of Soil and Water Conservation (Mar.-Apr. 1995) used simple linear regression to develop a snowmelt erosion index. Data for 54 climatological stations in Canada were used to model the McCool winter-adjusted rainfall erosivity index, y, as a straight-line function of the once-in-five-year snowmelt runoff amount, x (measured in millimeters).
a. The data points are plotted in the scattergram shown below. Is there visual evidence of a linear trend?
b. The data for seven stations were removed from the analysis due to lack of snowfall during the study period. Why is this strategy advisable
c. The simple linear regression on the remaining n = 47 data points yielded the following results:
Use this information to construct a 90% confidence interval for ß1.
d. Interpret the interval, part c.
The students were asked to evaluate the effectiveness of the format on an 11-point scale. What are the degrees of freedom associated with the test statistic?
find the true mean purity level
a student takes a 20-question multiple choice exam and guesses on each question. each question has 4 choices only one
Consumer Review posts reviews and ratings of a variety of products on internet. The following is a sample of 20 speaker systems and their ratings (www.audioreviews.com).
when circuit boards used in the manufacture of compact disc players are tested the long-run percentage of defectives is
What would be an appropriate graphical representation to show the dispersion of home prices in a particular city, such as San Diego? Consider what would be the dependent (y) and independent (x) variables? Explain your reasoning.
The gambler is paid later as follows, depending on the number of winners he picked. What is his expected gain? Remember, a loss is a negative gain, and that the bookie keeps the gambler's $20.
The mayor of a small town would like to know whether a local bond issue is likely to pass or not. He mails a survey to 500 randomly selected voters.
Ball bearings are mannormally distributed with a meanufactured with a diameter of 5 mm. But the process has variation, so the diameter is normally distributed with a mean of 5 mm and a standard deviation of .02 mm. A) What proportion of ball beari..
Complete the table above so that you can show the Jackson's what their expected payoff is.
Is there evidence that the population mean amount is different from 8.17 ounces? (Use a 0.05 level of significance and determine the p-value and interpret its meaning.
A regression of attitude toward legalizing marijuana on age (X1) and education (X2) produced the following estimated coefficients and standard errors for a sample of 265 persons.
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