Humans often collaborate to solve problems Would a chimpanze

Humans often collaborate to solve problems. Would a chimpanzee recruit another chimpanzee when solving a problem that requires collaboration? Researchers presented 8 chimpanzee subjects with food outside their cage that they could bring within reach by pulling two ropes, one attached to each end of the food tray. If a chimp pulled only one rope, the rope came loose and the food was lost. Another chimp was available as a partner, but only if the subject unlocked a door joining two cages. The same 8 chimpanzee subjects faced this problem in two versions: The two ropes were close enough together that one chimp could pull both (no collaboration needed), or the two ropes were too far apart for one chimp to pull both (collaboration needed). The goal is to determine whether the data provide evidence that chimpanzees recruit partners more often when a problem requires collaboration.

a. Which of the tests (options are one sample z-test for the mean, one sample t-test for the mean, one sample z-test for the proportion, matched-pairs t-test for the mean, two-sample (independent) t-test for the mean) are appropriate for this problem?

Solution

Here matched pairs t-test for the mean would apply.