The Spearman correlation between subject selection and difficulty.
| Physics 1 selection | Chemistry 1 selection | Biology 1 selection | Earth 1 selection | Physics difficulty | Chemistry difficulty | Biology difficulty | Earth difficulty | |
|---|---|---|---|---|---|---|---|---|
| Physics 1 selection | 1.000 | .147 |
-.337 |
-.290 |
-.264 |
-.086 |
0.027 | -.097 |
| Chemistry 1 selection | 1.000 | .104 |
-.190 |
-.144 |
-.263 |
-.210 |
-.200 |
|
| Biology 1 selection | 1.000 | -.243 |
0.080 | -0.074 | -.236 |
-0.029 | ||
| Earth 1 selection | 1.000 | .169 |
.135 |
.139 |
0.082 | |||
| Physics difficulty | 1.000 | .482 |
.465 |
.559 |
||||
| Chemistry difficulty | 1.000 | .604 |
.609 |
|||||
| Biology difficulty | 1.000 | .659 |
||||||
| Earth difficulty | 1.000 |
*: p < .05, **:p < .01