Google Data Analytics Professional Certification Practice Test

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Which geometric object is used in R to represent a line in a plot?

Geom_line
Geom_point
Geom_area
Geom_bar

The correct answer is: Geom_line

The correct choice is Geom_line, which is used in R's ggplot2 package to create line plots. In the context of data visualization, a line plot is particularly effective for showing trends over time or continuous variables, as it connects individual data points with a line. This helps in visualizing the relationship between two variables, often time on the x-axis and a quantitative measure on the y-axis. In contrast, Geom_point is used for scatter plots, representing individual data points rather than connecting them. Geom_area is employed for area plots, which fill the space beneath a line, but it does not specifically represent a line. Lastly, Geom_bar is designed for bar charts, which are used for categorical data or to display counts, and are not suitable for depicting a line within the context of a trend or continuous variable. Thus, when the goal is to visualize data trends with a line connecting points, Geom_line is the appropriate choice.