Researchers observed whether the chimpanzees with the unnecessary tool offered to help the other chimpanzee.

Sample: Five chimpanzees.

Sampling Technique: Opportunity sampling.

Research Method: Laboratory experiment.

Controls: Not specified.

Ethical Issues: The study involved working with animals, and the researchers needed to ensure the chimpanzees' welfare and safety.

Results: The study found that chimpanzees were more likely to offer help when the other chimpanzee needed the tool they had.

Conclusion: The study suggests that chimpanzees possess the ability and flexibility to help another chimpanzee based on their specific needs.

Strengths: The study used a controlled experiment, allowing researchers to manipulate the independent variable (need for help) and measure the effect on the dependent variable (helping behavior).

The study involved a relatively large sample size, increasing the generalizability of the findings.

Weaknesses: The study's findings may be limited to the specific context of the study (a laboratory setting).

The study used a limited number of chimpanzees, which limits generalizability.