Critical r | Critical r | ||||
---|---|---|---|---|---|
df | P = 0.05 | P = 0.01 | df | P = 0.05 | P = 0.01 |
1 | 0.997 | 1.000 | 19 | 0.433 | 0.549 |
2 | 0.950 | 0.990 | 20 | 0.423 | 0.537 |
3 | 0.878 | 0.959 | 25 | 0.381 | 0.487 |
4 | 0.811 | 0.917 | 30 | 0.349 | 0.449 |
5 | 0.754 | 0.874 | 40 | 0.304 | 0.393 |
6 | 0.707 | 0.834 | 50 | 0.273 | 0.354 |
7 | 0.666 | 0.798 | 60 | 0.250 | 0.325 |
8 | 0.632 | 0.765 | 70 | 0.232 | 0.302 |
9 | 0.602 | 0.735 | 80 | 0.217 | 0.283 |
10 | 0.576 | 0.708 | 90 | 0.205 | 0.267 |
11 | 0.553 | 0.684 | 100 | 0.195 | 0.254 |
12 | 0.532 | 0.661 | 125 | 0.174 | 0.228 |
13 | 0.514 | 0.641 | 150 | 0.159 | 0.208 |
14 | 0.497 | 0.623 | 200 | 0.138 | 0.181 |
15 | 0.482 | 0.606 | 300 | 0.113 | 0.148 |
16 | 0.468 | 0.590 | 400 | 0.098 | 0.128 |
17 | 0.456 | 0.575 | 500 | 0.088 | 0.115 |
18 | 0.444 | 0.561 | 1 000 | 0.062 | 0.081 |
df (= “degrees of freedom”) is equal to the number of observations (data pairs) minus two (thus df = n-2)
P = 0.05 and P = 0.01 refer to the probability of 5 and 1 percent, respectively, that the correlation, although “significant” is still the result of chance