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Instead of showing data over time, a box and whisker chart shows the data in numerical order, divided into 4 equal sections (quartiles). compare each store to the other two stores.see how each store's sales progress over the year.sales for three stores in a retail chain,.Most people are familiar with a line chart, where you show data over a period of time.įirst, we'll take a quick look at a line chart, then we'll see how a box plot chart would show the data in a different way.įor both types of chart, the same data will be used: The mean for this data set is 53.765.Download Sample File Box Plot Chart Overview The mean will be displayed in a new window. Step 5: Check the “Mean” box and then click “OK” twice. Step 3: Click the variables you want to find the mean for and then click “Select” to move the variable names to the right window. Step 2: Click “Stat”, then click “Basic Statistics,” then click “Descriptive Statistics.” The worksheet functions the same way as an Excel worksheet - the optimal place for your data is in a column format. Step 1: Type your data into columns in a Minitab worksheet. As Minitab was built for statistical analysis, it’s without the possibility of the types of system error you’ll see with Excel. Microsoft Excel does have some statistical capabilities, but it’s been looked at with skepticism in the past few years because of problems with incorrect calculations (this is true mostly for hypothesis testing). Additionally, you’ll have the data set entered into the system so you can perform further calculations without having to re-input your data. Typing the data into Minitab first gives you a way to check all of your inputs when you calculate the mean. Although finding the mean seems like an easy task, you can run into problems calculating the mean for large data sets - even if you use a calculator you might mistype numbers or skip numbers. To find an average, you sum all of the numbers and then divide by the number of items in the data set. The cars at the top are “above average” and the cars at the bottom are “below average.” JBleeker|Wikimedia CommonsThe mean is the average number of a dataset. A listing of cars that are ranked according to their means.