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A sample of students is signed up for a marathon. A second sample of students is signed up for a different marathon. The finish time

A sample of students is signed up for a marathon. A second sample of students is signed up for a different marathon. The finish time for each participant in each sample is recorded. The times are compared to see if there is a difference in the finish times of the two samples.

The samples are either independent or paired.

A sample of students is signed up for marathons in two different cities. The finish time for each race for each participant is recorded. The times are compared to see if there is a difference in the finish times of the two marathons.

The samples are either independent or paired.

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