A Chess Team Advisor Wanted to Examine How Long It

Multiple Choice

A chess team advisor wanted to examine how long it took his top two players, Fishy Bobber and Chet Mate, to complete their moves. Over the course of 50 matches each, Fishy averaged 330 seconds to move while Chet averaged 420 seconds to move. If the overall standard deviation for Fishy and Chet was 45 seconds, what was the effect size of their difference?

A) 1.0
B) 90
C) 2.0
D) Not enough information is given.