7QC Tools — How to Draw a Histogram?Amrendra Roy
First approach is by using the readymade template from ASQ, Histogram
Second approach is by using Excel sheet, following are the steps involved
Excel → data → data analysis → Histogram
Third approach is manually, it involves following steps
Step-1: Calculate the range (maximum-minimum)
Step-2: Divide range by number of classes you want (usually 5 or 7). This will give you class width.
Step-3: Defining class intervals. This is done starting from the minimum value in the data set and by adding the class width (step-2) to it. This will give you 1st class interval.
Second class interval is obtained by adding class width to the upper class limit of the first class interval.
Step-4: Step-3 is repeated 5 to 7 times depending on the number of class interval (step-2)
Step-5: segregate the data according to the class interval, this will give the frequency of each class.
Step-6: plot the bar graph between classes and the frequency to give histogram.
Fourth Approach: Using Minitab
Step-1: Go to Graph in menu section and then click histogram
Step-2: Once you click the histogram, a menu will appear where you require to select the type of histogram desired.
Step-3: After selecting the type of histogram, another menu will appear which needs to be filled
After filling the above data, click OK to get the histogram
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