Six study participants were asked to react to a stimulus. In one experiment, the participant must press a key upon seeing a blue screen. In another, it's a red screen. Times are measured in seconds. Blue times: 0.582, 0.481, 0.841, 0.267, 0.685, 0.450 Red times: 0.408, 0.407, 0.542, 0.402, 0.456, 0.533 Find the sample standard deviation by hand for the blue times. x x - x (x-x)