Final answer:
The statement is false. Cross-sectional data are collected once at a point in time, unlike longitudinal data which is collected repeatedly over time.
Step-by-step explanation:
The statement 'Cross-sectional data is a set of data values observed at successive points in time' is false. A cross-sectional study is actually an observational study in which data are collected from a sample of subjects just once at a certain point in time.
This is in contrast to longitudinal research, where data is collected from the same subjects repeatedly over a period of time.
In a cross-sectional study, researchers might compare different segments of the population at the same time, such as comparing the dietary habits of different age groups without following them over the years.