Manny creates a new type of bowling ball. His new model knocked down an average of 9.1 pins, with a standard deviation of 1.32 pins. The older model bowling ball knocked down 8.05 pins on average, with a standard deviation of 3.67 pins. He tested each bowling ball model 10 times. What is the effect size of the difference in the bowling ball models? (Write your answer below, to two decimal places as a positive value; sign doesn't matter)