Dr Farah Is an Educational Psychologist Who Is Interested in Studying

Multiple Choice

Dr. Farah is an educational psychologist who is interested in studying the potential causal relationship between doing homework and academic achievement. In January, Dr. Farah has her students report their fall GPA (a measure of academic achievement) and estimate how many hours they spent doing homework during a typical week in the fall semester. In May, Dr. Farah measures the same variables again (the estimated number of hours spent doing homework during a typical week in the spring semester and their spring GPA) . She finds the following correlations.

Based on her pattern of correlations, which of the following can Dr. Farah safely conclude?

A) Because Correlation 3 is significant but Correlation 4 is not, Dr. Farah has evidence that increased homework comes before academic achievement.
B) Because not all the correlations are significant, Dr. Farah has no evidence that increased homework comes before academic achievement.
C) Because Correlations 2 and 3 are significant, Dr. Farah has evidence that increased homework comes before academic achievement.
D) Because Correlation 4 is stronger than Correlation 5, Dr. Farah has no evidence that increased homework comes before academic achievement.