Graphs - Line Graphs
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LearningTranscript
00:00Hi kids! Today we will learn a type of data chart which is called line graph. So let's start.
00:10First of all, data chart is a type of diagram or graph where data is represented by various symbols.
00:20It can be bars, lines, and slices, etc.
00:27Charts makes it easy to understand large quantities of data and the relationship between parts of data.
00:37Data given in the form of charts is read more quickly.
00:43There are different types of charts.
00:46Today we will learn a type of data chart which is called line graph.
00:53A line graph is also a type of data chart where information or value of data are displayed as a series of dots or points connected by line segments.
01:07It makes comparison easier as plotted peaks and dips makes it easy to compare the values.
01:14Let's learn it more with the help of examples.
01:17Sale of garments was noted down for a particular company for a period of 5 months, that is, January to May.
01:2815,000 garments were sold in January.
01:3312,000 garments were sold in February.
01:3719,000 garments were sold in March and so on.
01:42We have to draw this information in the form of a line graph.
01:47First of all, let's give a title to our graph.
01:51Let it be Sale of Garments.
01:55Now, we always have two axes in a graph, x-axis and y-axis.
02:04We depict one type of information on x-axis and other on y-axis.
02:12Here, the two types of info we have are names of months, which is textual information, and sale of garments in a month, which is our numeric information.
02:28We always show numeric information on y-axis preferably.
02:34Let y-axis be for showing the sales, so make it Sales.
02:41And let x-axis be showing names of months, which is our textual information, so mark it Months.
02:51As we make a scale along the y-axis, to show the numeric values for making that scale, first see the range of values that we have to show on the scale.
03:03Here, the quantitative or numeric data we have is in the range of 12,000 and 22,000.
03:14That means we have to show numbers in the range of 12,000 and 22,000.
03:22So let's make a scale showing values 10,000 to 25,000, so as to accommodate all the numbers we have.
03:33And on x-axis, write the names of months.
03:38Sales for January are 15,000 garments, so we will make a dot along the month of January, and the sales, 15,000.
03:51Now this dot corresponds to month of January, and sales, 15,000 garments.
04:00Now plot the information, which is, sales for February are 12,000 garments, so we will make a dot along the month of February, and the sales, 12,000.
04:16Now this dot corresponds to month of February, and sales, 12,000 garments.
04:23Now join the two dots using a line.
04:27Now plot the next information.
04:31Sales for the month of March are 19,000 garments, so we will make a dot along the month of March, and sales, 19,000.
04:44Now this dot corresponds to month of March, and the sales, 19,000 garments.
04:52Similarly, plot all the information, join the dots, and the line graph is ready.
05:01Now let's read the line graph.
05:04Graph says, sales in January is 15,000 garments, whereas sales in February is reduced to 12,000, which is 3,000 lesser than January.
05:20And then, sales again increased to 19,000 garments in March, and sales further increased to 25 garments in April.
05:32That is, the sales reached its peak point, which is 25,000 garments.
05:39And sale decreased by 3,000, and is 22,000 in May.
05:47So we can clearly see the trends using the peaks and dips shown by a line graph.
05:54So kids, we learned how we can make a line graph for a given data, and also how to read it.
06:02Now, let's make one more line graph for practice.
06:07Number of people who watched a particular movie was noted down for a week.
06:13Sunday, 20,000 viewers.
06:17Monday, 18,000 viewers.
06:20Tuesday, 19,000 viewers, and so on.
06:27We have to draw this information into a line graph.
06:32First of all, let's give a title to our graph.
06:36Let it be, number of viewers.
06:39A graph always has two axes.
06:43And we depict two types of information on two different axes of the graph.
06:50Here, two types of info we have are, names of days, which is textual information.
06:59And, number of viewers of the movie, which is our numeric information.
07:05Let y-axis be for showing the number of viewers.
07:09So mark it, viewers.
07:12And let x-axis be showing names of the days, which is our textual days.
07:19So mark it, days.
07:22As we make a scale, along the x-axis to show the numeric values.
07:28For that, first see the range of values to show on the scale.
07:34The quantitative or numeric data we have is in the range of 14,000 to 24,000 viewers.
07:44That means, we have to make a scale that accommodate values showing 14,000 to 24,000.
07:55So let's make a scale showing 10,000 to 25,000.
08:00So that it accommodate all values.
08:03And on x-axis, write the names of names of days.
08:08Numbers of viewers on Sunday are 20,000.
08:13So we will make a dot along the day of Sunday, and number of viewers 20,000.
08:20Now this dot corresponds to the day of Sunday, and 20,000 viewers.
08:27Now plot the next information.
08:31Number of viewers on Monday are 18,000.
08:36So we will make a dot along the day of Monday, and viewers 18,000.
08:42Now this dot corresponds to day of Monday, and 18,000 viewers.
08:49Now join the two dots using a line.
08:53Now plot the next information.
08:56Numbers of viewers on Tuesday are 19,000.
09:01So we will make a dot along the day of Tuesday, and the viewers 19,000.
09:08Now this dot corresponds to day of Tuesday, and viewers 19,000.
09:15Similarly, plot the dots for all days.
09:19Join the dots using a line, and our line graph is ready.
09:25Let's read the line graph.
09:27Our line graph says, 20,000 people watched the movie on Sunday,
09:34which decreased by 2,000 on Monday.
09:39So it's 18,000 people on Monday.
09:43And then, on Tuesday, number of viewers increased to 19,000.
09:51On Wednesday, number of viewers decreased to 16,000.
09:57On Thursday, number of viewers decreased to 14,000.
10:03On Friday, number of viewers increased to 15,000.
10:08On Saturday, number of viewers increased to 24,000.
10:14So there is a big rise in the number of viewers on Saturday.
10:19So a line graph clearly shows the peaks and dips,
10:23where peaks are showing increase in the numeric values on y-axes,
10:29and dips are showing decrease in the numeric values on y-axes.
10:36So kids, today we learned what are line graphs,
10:40and how to read and draw a basic line graph.
10:44Now you may go ahead and take a quiz to learn more.
10:48Bye-bye.