2022 Introduction to Statistics in Research Mitchell 2nd ed

I N T R O T O R E S E A R C H : D A T A V I S U A L I Z A T I O N & C O M M O N S T A T T E S T S

There are specific things to look for – look for the maximum and minimum. Notice the median. Determine the third quartile and the first quartile. Look for the longer whisker for skewness. Look for outliers (the dot represents an outlier on school C in the first grouping).

Now, let’s look specifically at the box plot for English School A. (Quiz)

Table 56: Excel Box Plot concentrating on English School A

Let’s look at the Box Plot for English School A in Statistics Kingdom. Notice where the median is (63) and the longer whisker on the left. This means it is negatively skewed. In fact, the calculations shown for Skewness at Statistics Kingdom show a negative skewness of -0.0833987.

Table 57: Box Plot for English School A from Statistics Kingdom

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