You will use a line chart when you want to emphasize changes in values for one variable (plotted on the vertical axis) for continuous values of a second variable (plotted on the horizontal). We can read from the general slope of the line and its vertical positions that the rate improved from about 0.75 to 0.78 between March and early April, then fell gradually to about 0.765 in late May and June. As time progresses from left to right, points connect the daily exchange rates. The line chart above shows the exchange rate between two fictional currencies over a six month period. The horizontal axis depicts a continuous progression, often that of time, while the vertical axis reports values for a metric of interest across that progression. A line chart (aka line plot, line graph) uses points connected by line segments from left to right to demonstrate changes in value.
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