2.1 statistical measures

What is a measure of location?

Gives information about where data is in the number system

What is a measure of central tendency?

Describes where the centre of the data's

What is the mode?

The value that occurs most often

What is the median?

The middle value when data is in size order

What is the mean?

Sum of all values divided by number values

What are summary statistics?

Information that summarises a set of data values

How is sum of data represented?

Sigma x

How is mean of data represented?

X bar

What are the quartiles?

Divides data into 4 equal sections

What are percentiles?

Divide data into 100 parts

What is the range?

The difference between the largest and smallest values in the set

What is the interquartile range?

Difference between upper quartile and lower quartile

What is variance?

A statistic that tells us now varied a set of data is

What is standard deviation?

Square root of variance

What is the symbol for variance?

Sigma squared

What is the symbol for standard deviation?

Sigma

How can variance be calculated?

Variance = sum of X squared/n - sum of mean squared