Final answer:
The key function of a research plan is to identify the data that need to be collected and analyzed.
Step-by-step explanation:
The key function of a research plan is indeed to identify the data that need to be collected and analyzed.
A research plan helps outline the specific information or observations that scientists need to gather in order to answer their research question or test their hypothesis.
By carefully planning the collection and analysis of data, researchers can ensure that their study is methodical and objective.