Final answer:
The statement is true; a time-series chart is a graphical representation that shows how a variable changes over time, useful for observing trends in continuous data like stock prices.
Step-by-step explanation:
True: A time-series chart is indeed a graphical representation showing the change of a variable over time. These charts are essential for displaying data that changes continuously, such as stock prices, unemployment rates, or economics data, like prices, wages, and quantities bought and sold.
Line graphs are typically the most effective format for time-series graphs as they can effectively illustrate the relationship between two variables, particularly when both variables are changing over time. These graphs enable observers to spot trends and patterns that could be difficult to discern from raw data alone. However, care must be taken as graphs can also potentially mislead depending on how they are presented, showing different perspectives of the same data.