Final answer:
A benefit of test independence is that testers have different biases than developers, which reduces experimenter bias and can lead to more objective testing outcomes.
Step-by-step explanation:
One of the benefits of test independence is that testers have different biases than developers. Test independence can help in achieving more objective results by mitigating experimenter bias, which refers to the possibility that a researcher's or observer's expectations may inadvertently affect the outcome of a test. In the field of software development, this means that testers evaluate the product without prejudice, potentially catching issues that developers might overlook due to their closeness with the codebase or desire to confirm their own hypotheses about the software's functionality.
Moreover, in scientific research, using control and test groups with as little difference as possible, except for the variable under study, ensures that the results are more reliable and valid. This is why it is essential to have a test group and a control group that are identical in every aspect except for the independent variable being tested.