Answer:
False
Explanation:
It is false that Cross-sectional data contain values of a characteristic of one subject collected over time.The type of data composed by observing many subjects at the same point of time are called Cross-sectional data. Cross sectional data always relates to enterprises, households etc and it is observed at a given date.For example if we are taking a annual statistics of any thing for year 2019, it would comprise on that particular year.
I believe the answer is: double-blind experiment
In double blind experiments, the subjects that receive the treatment is remained unknown by both the researchers and the subjects until the experiment is finished. The main purpose of double-blind experiment it eliminate the bias of perception that might exist among researchers.
If the president dies or is Assassinated
