Measures of Center and Spread

Front

What is Standard Deviation?

Back

Standard Deviation is a measure of spread that represents the average distance of each data value from the mean.

Front

What is the mean of the data set: 21, 31, 26, 24, 28, 26?

Back

The mean is 26.

Front

What are Quartiles?

Back

Quartiles are values that divide a data set into four equal parts.

Front

What is the Range in a data set?

Back

The Range is the difference between the greatest and least data values.

Front

What is an Outlier?

Back

An Outlier is a value in a data set that is much greater or much less than most of the other values.

Front

How do you calculate the Mean?

Back

To calculate the Mean, add all the data values together and divide by the number of values.

Front

What does it mean if a data set has a high Standard Deviation?

Back

A high Standard Deviation indicates that the data values are spread out over a wider range.

Front

What does it mean if a data set has a low Standard Deviation?

Back

A low Standard Deviation indicates that the data values are close to the mean.

Front

How do you find the Median of a data set?

Back

To find the Median, arrange the data in order and identify the middle value.

Front

What is the Interquartile Range (IQR)?

Back

The IQR is the difference between the first quartile (Q1) and the third quartile (Q3), representing the middle 50% of the data.