Final answer:
The correct statement about graphs and charts in R is that they help visualize data, displaying the distribution for a variable.
Step-by-step explanation:
The true statement about graphs and charts in the context of R is that graphs and charts in R help us to visualize our data so that we can see the entire distribution for a variable. The other statements provided have issues: it is necessary to import the dataset before plotting in R, scatter plots are used to show the relationship between two variables, not the frequency distribution of a variable, and histograms are utilized to display the distribution of a single variable, not the relationship between two variables.
Graphs serve a fundamental role in expressing equations visually and in displaying statistics or data. For instance, line graphs display the relationship between two variables, using one axis for each variable. Pie graphs represent how a whole is divided into parts, with slices corresponding to the percentages of each part. Similarly, bar graphs use the height of bars to represent relationships and can show segments within each bar to detail subgroups.