MAT243 - 1.5 Line Charts.doc - A line chart(or line graph depicts data trends by using straight lines to connect subsequent data points in a scatter

MAT243 - 1.5 Line Charts.doc - A line chart(or line graph...

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A line chart (or line graph) depicts data trends by using straight lines to connect subsequent data points in a scatter plot. The straight lines show the general direction that data changes over time. Because trends involve time, line charts commonly use a time metric for the horizontal axis. Ex: Given the following data on Apple stock prices from March 2015 to March 2016, the subsequent line chart shows how Apple's stock price changes (vertical axis) as each month passes (horizontal axis). Table 1.5.1: Apple stock prices. Date Apple Stock Price Mar 2, 2015 129.09 Apr 1, 2015 124.25 May 1, 2015 128.95 Jun 1, 2015 130.54 Jul 1, 2015 126.60 Aug 3, 2015 118.44 Sep 1, 2015 107.72 Oct 1, 2015 109.58 Nov 2, 2015 121.18 Dec 1, 2015 117.34 Jan 4, 2016 105.35 Feb 1, 2016 96.43 Mar 1, 2016 100.53 Source: Yahoo! Finance, 2016 Feedback?

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Figure 1.5.1: Apple stock charts (March 2015 - March 2016) with and without lines. Feedback? The main benefit of a line graph's lines is to help the brain quickly determine if values are increasing, decreasing, or remaining constant between data points. Steeper lines indicate more rapid increases or decreases, while flatter lines indicate little change between data points. Ex: The line graph above clearly shows that the steepest increase in the stock value was from October to
November, which may lead investors to research what happened to Apple in October 2015. Lines also help convey that values exist between data points. Ex: Although the Apple line chart shows two consecutive data points for July 1 and August 3, the stock price took on many values in between those dates. The line connecting July 1 and August 3 does not represent real data, but rather, a basic trend of the data change between data points. PARTICIPATION ACTIVITY 1.5.1: Interpreting line chart trends. Consider the following line chart of Alphabet (Google's parent company) stock from March 2015 to March 2016: 1) Google's stock price decreased from December to January.

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