Hi. I need help understanding how the calculation below equals .006 using this formula. Thank you for your help.

To calculate eta squared see the formula on p. 346 in Warner (2020). Eta square can be calculated using the formula n²=t²/(t²+df). Open the Effect Size Table document or go to Table 12.2 (p. 352) in Warner 2020 to determine the effect size verbal label.

Calculation:

t = -.302

d.f. = 14

h² = t²/(t²+ df) orh² = .091/(.091 + 14) = .006

Eta squared = .006 a small effect size.

Verbal Label Eta Squared Pearson r r 2 (12) Extremely .500 + .707+ .500 + Large Very Large .168 to .499 .410 to . 706 .168 to .499 Large 083 to .167 .287 to .409 083 to .167 Medium .022 to .082 .148 to .286 022 to .082 Small .002 to .021 .050 to .147 .002 to .021 No effect .000 0.00 .000 Source: Adapted from Warner (2020)