This post is based on Yatani’s wiki on HCI Stats.

**What is a bar plot? When would you use it?**

A bar plot shows a bar whose length (or height) is proportional to the value of the data entry.

A bar plot can be used to show, for example, the data (in particular, the means, errors) observed from different groups.
**What is a box plot? When would you use it?**

A box plot visualizes “Here’s where X% of the data points go to”. For example, the median value is rendered as a bold line, then two other quantiles (forming the top and the bottom of the box) marks values under which there is 75% and 25% of the data points, respectively.

(Another way to see it is a box plot gives a five-number summaries:

– the smallest observation;

– lower quantile (Q1);

– median (Q2);

– upper quantile (Q3);

– the largest observation.

A box plot can be used to show “what your data looks like” (“what range of value the data goes to”). It provides more information than a bar plot.
**What is a multiple dot/line plot? When would you use it?**

A multiple dot/line plot shows individual data points and/or connects them if they belong to the same group.

It is useful to show the evolution of observation over period (e.g., through sessions in an experiment).
**Create a bar plot; create a bar plot with error bars.**

**Create a box plot. Point out the ‘five-number’ lines.**

**Create a multiple dot/line/dot+line plot.**

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