On a standard test, the population is known to have a mean of 500 and a standard deviation of 100. Those receiving an experimental treatment have a mean of 540. The effect size is \(\_\_\_\_\_\_\) (rounded off to two decimal places).
The standard deviation for the following scores: 8, 6, 6, 9, 6, 5, 6, 2 is \(\_\_\_\_\_\_\) (rounded off to two decimal places).