An instructor asked five students how many hours they had studied for an exam. Here are the hours studied and the students' grades:
Hours Studied Test Grade
0………………………… 52
10……………………….. 95
6………………………… 83
8………………………… 71
6………………………… 64
(b) Describe in words the general pattern of correlation, if any.
(c) Figure the correlation coefficient.
(d) Figure whether the correlation is statistically significant (use the .05 significance level, two-tailed).
(f) Give three logically possible directions of causality, saying for each whether it is a reasonable direction in light of the variables involved (and why).