Question: 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 night’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:

Determine whether or not the groups differ significantly. If you reject your null hypothesis, tell what it means in the context of the problem. Give the table values required for significance.

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