Unit 1 Vocabulary Set - Exploring One-Variable Data

Discrete Variable

A quantitative variable that takes a fixed set of possible values with gaps between them.

Continuous Variable

A quantitative variable can take any value in an interval on the number line.

Frequency table

A table that shows the number of individuals having each value. (Two-way Table)

Relative Frequency Table

Shows the percentage of individuals having each value.

Histogram

A type of data representation that displays distribution of a quantitative variable. The horizontal axes identify intervals of values that the variable takes.

Bar Graph

A type of data representation that displays the distribution of a categorical variable. The axis identify the categories.

Whisker Plot (Box plot)

A way of representing quantitative data that give us an idea of how spread out a set of data is using the Quartiles and the median.

Variance

The value we obtain before squaring rooting to calculate the standard deviation of a set.

Standard Deviation

A statistical value that measures the typical distance of the values in a distribution from the mean.

Outlier

A value far away from the rest of the numbers in the distribution. Usually, 2 points away from the standard deviation.

Normal Distribution

The distribution that is described by a symmetric, single-peaked, bell-shaped density curve called a Normal Curve. Normal distribution is specified by two parameters: Mean and Standard Deviation.

Statistics

A number that describes some characteristics of a sample.

Parameter

A number that describes some characteristic of a population.