#GROUPED DATA HISTOGRAM MAKER HOW TO#
This next video shows how to make a Class Intervals Histogram directly from a set of numbers, without drawing the actual Frequency Table. Watch this video carefully, as it covers all the steps needed to draw a Histogram from a frequency table which has been supplied to you. The following video shows how to make a Histogram where we use “Class” groups which are each covering a range of ten items. Watch this video about making Frequency Tables.
The “Frequency” value of “2” for this item means that there were two separate hours where this situation occurred. Note that 0-3 means zero to three cups of coffee were made in a one hour period. The following is a Frequency Table which uses groups of data called “Classes” to summarise a survey of how many cappuccinos a Cafe was making per hour. To create smaller graphs from data with lots of different number values, we set up and use groups called “Class Intervals” or “Classes”.
#GROUPED DATA HISTOGRAM MAKER FREE#
To use this free interactive online, click the following link: Having wider Intervals or Bins in the grouped data creates less columns, and makes a far more readable graph. Narrow Intervals or Bins gives too many columns: Simply adjust the slider below the graph to change the effect.Įg.
The following free online interactive demonstration is great for seeing how changing the “Bin Size” or “Class Interval Width” affects the number of resulting columns on a Histogram. Graphs which have more than ten bars are sometimes necessary, but are very difficult to read, due to their size and complexity. Whenever we make a Histogram to go into a Business Report, or the Newspaper, or our Maths Work Book, we need a graph which has between 5 and 10 bars on it. If you do not know anything about Histograms, then click the link below to do our lesson on Basic Histograms:
This lesson assumes that people already know how to draw basic Histograms.
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