Super Interactive Data Displays Review

Box and Whisker Plots: Split data into 4 groups.

How to make them

●Order data least to greatest.

●Find the median.

●Find the middle of the lower and
upper halves above/below the
median. Those are quartiles.

●Make a number line.

●Plot the minimum, lower quartile,
median, upper quartile, and
maximum values.

●Connect to make the “cat”.

IQR or Interquartile Range

Measure of spread. How spread out is the
middle half of the data?

This makes the “box” of the plot. 50% of the
data are in this “box”.

Interpret them. Where is the spread? Top 25%? Bottom
half?

75% of the animals live 17.5 years or less. (Q3)

50% of the animals live more than 11 years. (median)

Stem and Leaf Plots

Stem and Leaf Plots: Keys, back to back.

Random Sample

Can’t ask everyone?

Ask a small group that is like the big
group.

Everyone must be equally likely to be
asked. If they aren’t, your sample may be
biased.

Look at graphs A and B. Graph B exaggerates the differences in temperature by starting at 98 degrees and counting in 0.5 degree steps.