Each year, students in an elementary school take a standardized math test at the end of the

Question:

Each year, students in an elementary school take a standardized math test at the end of the school year. For a class of fourth-graders, the average score was 55.1 with a standard deviation of 12.3. In the third grade, these same students had an average score of 61.7 with a standard deviation of 14.0. The correlation between the two sets of scores is r = 0.95. Calculate the equation of the least-squares regression line for predicting a fourth-grade score from a thirdgrade score.

a. ŷ = 3.58+0.835x

b. ŷ = 15.69+0.835x

c. ŷ = 2.19+1.08x

d. ŷ = −11.54+1.08x

e. Cannot be calculated without the data.

Select the best answer.