The results of one study determined that about 80 of the var

The results of one study determined that about 80% of the varation in students final exam scores is explained by the varation in the total number of hours spent studying during the semester. Suppose the final exam scores and hours spent studying during the semester are obtained for members of a class of 40 students. These data are used to run a regression. A) What is the independent variable? B) If you construct a scatter plot, which of the following most likely describes the trend you will observe (Circle your choice) i) From left to right, plotted points will trend upward ii) From left to right, the plotted points will trend downwards. iii) There is no way to predict how the data will trend. C) Approximate r, the correlation coefficient, to three decimal places.

Solution

A) What is the independent variable?

students final exam scores

----------------------------------------------------------------------------------------------------------------------

B) If you construct a scatter plot, which of the following most likely describes the trend you will observe (Circle your choice)

i) From left to right, plotted points will trend upward (Answer)

ii) From left to right, the plotted points will trend downwards.

iii) There is no way to predict how the data will trend.

----------------------------------------------------------------------------------------------------------------------

C) Approximate r, the correlation coefficient, to three decimal places.

r= sqrt(0.8) = 0.894