Measures of Central Tendency and Standard Deviation

What is the definition of mean in statistics?

The mean is the average of a data set.

How do you calculate the mean of a data set?

Sum of values divided by the number of values

What is the first step to calculate the median?

Arrange your data set in ascending order.

What do you do after arranging the data set to find the median?

Find the middle number.

Median Definition

The point on the scale that divides the distribution of scores in half.

What is the mode in a data set?

The number that appears most frequently.

How do you find the mode in a data set?

Arrange all the numbers from least to greatest and find the most occurring value

Standard Deviation

A measure of the amount of variation of the values of a variable about its mean.

What does a low standard deviation indicate?

Values tend to be close to the mean.

High Standard Deviation

Values spread over wider range.

Standard Deviation Use

Commonly used to identify outliers and judge how reliable data seems.