Table 1. Descriptive statistics showing the effect of less than 7 hours of sleep per night on reaction time as measured by the ruler drop test. Reaction Time (sec.) Less than 7 hours of sleep Mean (x) 0.1216 Std Dev. (s) 0.045206194 0.028109634 0.1 12 Range 0.127 Sample Size (n) 10 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 Amount of sleep students usually have More than 7 hours of sleep 0.134166667 0 Less than 7 hours of sleep More than 7 hours of sleep