Series: Visualising Data
In this video we'll look at how to build bar graphs and pie charts to represent a data set, and we'll talk about when these types of charts are useful, and when they probably shouldn't be used.
In this video we'll work on actually building a histogram from a data set. In order to build a histogram, we'll need to determine the class interval, which means we'll need to look at class width and class midpoint.
In this video we'll look at how to build a dot plot from a frequency table. As the name implies, a frequency table displays the frequency at which different things occur. We can translate the table into a visual representation, called a dot plot, that shows a dot for each occurrence in the table. Show Less
A histogram, also called a frequency histogram, is just like a bar graph, except that we collect the data into buckets or bins, and then sketch a bar for each bucket. Each bucket needs to be the same size, or width, so that they’re capable of holding the same amount of data. One reason we might want to use a histogram instead of a bar graph is because we have too many data points to plot individually. Show Less
A joint distribution is a table of percentages similar to a relative frequency table. But in a joint distribution, we show the joint distribution of one set of data against the distribution of another set of data. For instance, we could display the amount of weight lost by study participants, compared to the amount of time they spent exercising. Show Less
In this video we'll look at how to build line graphs and ogives to represent a data set, and we'll talk about when these types of charts are useful, and when they probably shouldn't be used.
One-way data tables are data tables with just column headers and one row header, just row headers and one column header, or only column headers or only row headers. We can locate the cell in the table we're referring to just by asking one question. For instance, if we have a one-column table, with the single column header as a particular year, and the row headers as the months of that year, we'd only need to ask which month we're referring to in order to locate the correct cell in the table. The reason is because the months are the only option available to choose, the single year is already set. Show Less
In this video we'll talk about relative frequency tables, of which there are three types: row relative frequency tables, where we see totals for each row, column relative frequency tables, where we see totals for each column, and total relative frequency tables, where we see totals for both the rows and columns, as well as a grand total for the whole table. Show Less
Two-way data tables are data tables with column headers and row headers. We can locate the cell in the table we're referring to by asking exactly two questions. For instance, if we have a table with years for column headers and months for row headers, we'd need to ask about both the month and year we're referring to in order to locate the correct cell in the table. The reason is because both the months and the years are options available to choose. Show Less
Venn diagrams can be a great way to illustrate the values in a data set. They let us quickly see where in our data we have similarities and differences. We plot data with similarities in the overlapping part of the diagram, and data with differences in the nonoverlapping part of the diagram. Show Less