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An article in the Journal of Environmental Engineering (Vol. 115, No. 3,1989, pp. 608-619) reported the results of a study on the occurrence of sodium and chloride in surface streams in central Rhode Island. The following data are chloride concentration y (in milligrams per liter) and roadway area in the watershed x (in percentage).
a) Draw a scatter diagram of the data. Does a simple linear regression model seem appropriate here?
b) Fit the simple linear regression model using the method of least squares.
c) Find an (unbiased) estimate of σ2.
d) Estimate the mean chloride concentration for a watershed that has 1% roadway area.
Mention the characteristics of Statistics. Explain any two applications of Statistics.
For a normal distribution why do we calculate the probability of a range of numbers instead of the probability of a single number?
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Which of the following does Utts consider a disaster in sampling?sk question #Minimum 100 words accepted#
(A) Find the binomial probability P(x = 5), where n = 15 and p = 0.50. (B) Set up, without solving, the binomial probability P(x is at most 5) using probability notation. (C) H
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Use the concepts of sampling error and z scores to explain the concept of distribution of sample means.
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