Line and Bar Graphs 03:37 minutes

Video Transcript

Transcript Line and Bar Graphs

To check his stress level, Frank the Insurance Guy is at his weekly doctor's appointment. The doctor's prognosis isn't good. The doctor says that Frank has TMS Syndrome; TMS - Too Much Stress, to be exact; and prescribes a vacation, STAT! Frank seems skeptical. To illustrate the urgency of the situation, the doctor shows Frank data documenting his stress level in the form of a few charts. With the help of line and bar graphs, surely Frank the Insurance Guy'll better understand his situation.

So, on his doctors’ orders, Frank hops on a plane for the Bahamas. While on the boat heading to his vacation island, he sees the beautiful beach, the clear blue water and pigs swimming in the water. Pigs swimming in the water?! How cool! At the beach, Frank begins to fidget. He actually doesn't know how to relax! He has to do something, so he decides to keep a daily record of the number of pigs he sees swimming in the water during his vacation. Each day, at the same time, Frank counts the number of pigs in the water and records the data in a table.

Bar graphs

Let's take a look at the table. It shows the data for one week. To make the information easier to understand, Frank first draws a bar graph. Notice the days of the week are graphed on the x-axis, and the number of swimming pigs on the y-axis. The data points are illustrated with one bar for each day. See how the highs and lows are easy to pick out? Bar graphs are useful to show data that changes over time. But what if you wanted to plot more than one week's worth of data? What about three or four weeks' worth?

Line graphs

For tables with many data points, Bar graphs might not be the best way to go. Line graphs give you the same information as a bar graph. Each bar is replaced with a point. The resulting points can then be connected, making trends in the data easier to visualize.

Because Frank can’t handle so much down time, and because counting the pigs in the water isn’t a day-filling task, Frank also monitors his relaxation level every day of his vacation. After one week, the data table looks like this. Notice, he used mood icons to describe his relaxation level, rather than numbers. For a better overview, he draws a line graph. On the x-axis is the number of days, and on the y-axis, the mood icons, and then he draws in a line to connect the data points. Holy oink! The two graphs look almost the same!

Is there a relation between the number of pigs in the water and Frank’s relaxation level? Although we told him that just because the graphs look the same, there is not necessarily a relation - that would be ridiculous, but Frank isn't convinced. He lives for statistics, so he really believes the pigs are helping him relax. Frank has a crazy idea. Maybe Frank can relax when pigs fly?