A Researcher Conducts a Study of Different Instructional Methods

A researcher conducts a study of different instructional methods. The researcher finds that student scores increase significantly when instructional time increases, so she predicts that scores will be even higher if the instructional time is 12 hours per day. Evaluate the prediction.

A) The prediction is problematic because 4, 5, 6, and 12 are not equally spaced.
B) The prediction is problematic because the classes with longer instructional time may not have the same number of students.
C) The prediction is problematic because we have no way of knowing what the trend is outside of the range of 4 to 6 hours of instructional time.
D) The prediction is accurate because it is based on empirical evidence.