For Questions , use the following narrative
Narrative: Study time and exam score
Suppose an algebra professor found that the correlation between study time (in hours) and exam score (out of 100) is +.80, and the regression line was found to be y = 20 + 4x.He arrived at this equation through years of collecting data on his students, most of whom reported studying anywhere from 0 to 20 hours for his exams.
-{Study time and exam score narrative} For which values of study time does the professor's regression equation make sense in terms of predicting exam scores?
A)Between 0 and 20 hours.
B)Between 0 and 100 hours.
C)Anything greater than or equal to 0 hours.
D)It is not possible to predict exam score with study time.

Question

Quizplus · Accepted Answer

The regression equation makes sense in terms of predicting exam scores for study times between 0 and 20 hours because this is the range of study times that the professor collected data on. The equation may not hold true for study times outside of this range, as the professor did not collect data on those study times.

For Questions , Use the Following Narrative