3.An experiment was performed to measure the effect of sleep deprivation on cognitive performance.Twenty college juniors were randomly selected from a group of volunteers and arbitrarily assigned either to a sleep deprivation group or to a control group.The participants in the sleep deprivation group were kept awake for 24 hours; the members of the control group had a normal might's sleep.Participants were then asked to perform a simple mental arithmetic task, and the time it took each participant to complete the task was recorded.The results were as follows:

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