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For randomly selected students the hours a week they


For randomly selected students, the hours a week they studied and thier grades (0=E,1=D, 2=c, 3=B, 4=A) are given below.

hours, x grade y

3 0

9 2

11 3

15 4

Find the correlation coefficient

At the 0.05 level of significance, test the level of significance of the correlation coefficient r.

Determine the regression line equation

For a person who studies 10 hours a week, what is the best predicted estimate of his/her grade?

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