Final answer:
Scatterplot markers should not necessarily be connected by a line, as this is false; scatterplots represent individual data points, and lines or curves are used to indicate trends.
Step-by-step explanation:
The statement "Scatterplot markers should be connected by a line" is False. Scatterplots are used to display the relationship between two variables and depict individual data points. Connecting these points with a line is typically reserved for line graphs that represent continuous data.
In scatterplots, a line of best fit may be added to show the overall trend or pattern in the data, but this is not the same as connecting the markers. When representing more complex relationships, such as those in non-linear regression, curves may be fitted to the data points.