PSSA Box Plots

A box plot is a graphical representation of a dataset that shows its minimum, first quartile (Q1), median, third quartile (Q3), and maximum values.

The median is the middle value of a dataset when it is ordered from least to greatest. It divides the dataset into two equal halves.

The interquartile range (IQR) is found by subtracting the first quartile (Q1) from the third quartile (Q3). IQR = Q3 - Q1.

The minimum value in a box plot indicates the smallest data point in the dataset.

The maximum value in a box plot indicates the largest data point in the dataset.

The first quartile (Q1) is the median of the lower half of the dataset, representing the 25th percentile.

The third quartile (Q3) is the median of the upper half of the dataset, representing the 75th percentile.

You can determine the number of data points above a certain value by counting the data points that fall above the upper whisker of the box plot.

A longer box in a box plot indicates a greater interquartile range (IQR), meaning there is more variability in the middle 50% of the data.

A box plot provides information about the central tendency, variability, and skewness of the data distribution.