statistical significance. What does statistically

significant mean?

significant if the probability of achieving the result

or a result more extreme by chance alone is less

than . 05.

significance reflects the chance probability, not the

magnitude or effect size of a difference or result. A

result could be statistically significant and the

difference between two groups could be very small.

Also, a difference between two groups could be large

but the difference fails to be statistically significant

(the chance probability is greater than . 05).