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The following data show the number of hours studied for an exam, x, and the grade received on the exam, y (y is measured in 10's; that is, y = 8 means that the grade, rounded to the nearest 10 points, is 80).

2	2	2	3	3	3	4	4	4	5	5	6	7	7	8
6	7	8	5	6	8	6	7	8	8	9	10	8	10	10

Calculate the estimated standard error of regression, s_b₁, for the number of hours studied-exam grade relationship explained above. (Give your answer correct to four decimal places.)

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