Percentiles, Quartiles & Boxplots - StatCrunch How to. STATS 2020 PDF

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StatCrunch Guide for Percentiles, Quartiles & Boxplots Page 1 of 4

Exam ple: Using StatCrunch for Percentiles, Quartiles, and Boxplots Problem The following numbers are exam scores from a standardized chemistry exam:

Find the following: a)

n

b)

The 70

c)

The five-number summary

th

percentile

Then, using the five-number summary, make a boxplot.

StatCrunch Guide for Percentiles, Quartiles & Boxplots Page 2 of 4 Solution We will use StatCrunch to solve all parts of this problem. First, we can easily find n just by counting. are 27 data values. n = 27 We will do parts b) and c) at the same time using the following steps After entering the data in the first column, select Stats, Summary Stats, and then Columns:

Next select the data that you would like to see and enter the desired percentile:

There

StatCrunch Guide for Percentiles, Quartiles & Boxplots Page 3 of 4 Click “Compute!” and you will see the following:

We can now answer parts b) and c). The 70

th

percentile is 87 and the five-number summary is {48, 71, 78, 89, 99}

Next, lets make a boxplot. Simply select Graph and then Boxplot.

Make sure you select the appropriate column (this is where your data lives).

StatCrunch Guide for Percentiles, Quartiles & Boxplots Page 4 of 4 The boxplot in StatCrunch looks a little different than the examples in most textbooks because they are vertical.

However, they work the same way....