Reference no: EM131137302
The table at the bottom of the page shows how the history and economics scores of 25 students are distributed. Use the method of Exercise 32 to determine the value of r, replacing the row headings by the corresponding class marks (midpoints) 23, 28, 33, 38, 43, and 48 and the column headings by the corresponding class marks 23, 28, 33, 38, and 43. Use this value of r to test at the 0.05 level of significance whether there is a relationship between scores in the two subjects.
Exercise 32
In a random sample of n pairs of values of X and Y, (xi, yj) occurs 
ij times for i = 1, 2, ... ,r and j = 1, 2, ... , c. Lettingi· denote the number of pairs where X takes on the value xi and ·j the number of pairs where Y takes on the value yj, write a formula for the coefficient of correlation.
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Calculate the thickness of the soil layer that was eroded
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Compare this interval with the one obtained
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Page shows how the history and economics scores
: The table at the bottom of the page shows how the history and economics scores of 25 students are distributed. Use the method of Exercise 32 to determine the value of r, replacing the row headings by the corresponding class marks (midpoints) 23, 2..
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