Question

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

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

(a) Use the given scatter diagram to estimate r for the sample data on the number of hours studied and the grade.
r ≈  

(b) Calculate r. (Give your answer correct to two decimal places.)
r =

Answer 1

a)

b)

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