Question

A professor determined the relationship between the time spent studying (in hours) and performance on an exam. Performance = 70.443 + 4.885 * (time) Ann studied 2.6 hours for the last exam. However there was a concert in town the night before and her score was 16 points lower than expected. What was her score on this exam, rounded to the nearest integer?

Answer 1

First we need to calculate Ann's predicted score.

$Predicted Score = 70.443 + (4.885)(2.6)$

Ann's predicted score was 83.114

Since her actual score was 16 points lower than this, we just subtract.

$Real Score = 83.114 - 16$

Ann's real score was 67.114

When rounded to the nearest interger Ann's score is 67