External Vocabulary NCEA level one

Probability

A measure of the likelihood that an event will occur.

Tree Diagram

A diagram that shows all of the possible arrangements of objects or outcomes of an event.

Mean

The sum of a set of numbers divided by how many numbers are in the set.

Median

The MIDDLE NUMBER (or average of two middle numbers) of a group of numbers listed in order.

Mode

The number that occurs the most often in a set of data.

Box and Whisker Plot

A graphical display that uses a box to represent the middle of a set of data and segments drawn to extremes on both ends.

Minimum

The smallest number in a data set (box & whisker).

Maximum

The largest number in a data set (box & whisker).

Lower Quartile

The median of the lower half of data (box & whisker).

Upper Quartile

The median of the upper half of data (box & whisker).

Interquartile Range

The difference between the upper and lower quartiles.

Range

The difference between the upper and lower extremes.

Scatterplot

A graph used to show the relationship between two numeric variables.

Positive Correlation

Data points on a scatterplot whose y-coordinates seem to increase as the x-coordinates increase.

Negative Correlation

Data points on a scatterplot whose y-coordinates seem to decrease as the x-coordinates decrease.

No Correlation

Data on a scatterplot for which no pattern exists between the x and y coordinates.

Bar Graph

A graph that organizes a collection of data by horizontal or vertical bars to display how many times each event occurs.

Time series Graph

A graph that shows trends over time.

Pie Graph

A graph that shows portions of data collections as part of a circular region.

Histogram

A bar graph in which the bars represent equally spaced intervals of numbers.

Trend

a pattern of change over time(Time series)

Categorical Data

Data that consists of names, labels, or other nonnumerical values

Numerical Data

Data that consists of numbers

Discrete data

Numerical data values that can be COUNTED

Bivariate Data

Data collected for two variables for each individual in a study, eg height and weight

Pattern/seasonality

Description of repeated patterns over time (Time Series)

Variation

Analysis of how much variation there is between peaks and troughs (Time Series)

Census

Data from an entire population

Sample

Using a non biased selection of a population for statistical analysis