Ch2: Variables and Graphics

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7 Terms

1
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What are the 2 types of data?

  1. Categorical (aka class) variables

  2. Numerical ( aka quantitative) variables

2
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What are 2 (sub)types of categorical variables?

  1. Ordinal (in order) variables = if the different categories have an inherent order to them.

  2. Nominal variables = if no inherent order to categories

3
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What are 2 (sub)types of numerical variables?

  1. Discrete = can be counted (# of limbs, offspring, etc.)

  2. Continuous = can be measured (arm length, height, etc.)

4
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When do you use bar graphs?

When showcasing discrete (categorical) variables

5
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When do you use histograms?

When showcasing continuous variables

6
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What is a quantile?

A value that divides a sorted dataset or probability distribution into equal-sized, continuous intervals, representing the proportion of the data.

→ quartiles = four different parts.

→ represented from 0-1

7
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What is a percentile?

a measure used to show what percentage of values/scores in the dataset fall below a specific point, indicating points relative standing.

→ good to use for CDFs

<p>a measure used to show what percentage of values/scores in the dataset fall below a specific point, indicating points relative standing.</p><p>→ good to use for CDFs</p>