Measures of Center and Variability

Front

What is the mean in statistics?

Back

The mean is the average of a set of numbers, calculated by adding all the values together and dividing by the number of values.

Front

What is the median in statistics?

Back

The median is the middle value in a set of numbers when they are arranged in ascending or descending order.

Front

What is the mode in statistics?

Back

The mode is the value that appears most frequently in a data set.

Front

What is the range in statistics?

Back

The range is the difference between the highest and lowest values in a data set.

Front

What is the interquartile range (IQR)?

Back

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

Front

What is standard deviation?

Back

Standard deviation is a measure of the amount of variation or dispersion in a set of values.

Front

When should you use the mean as a measure of center?

Back

Use the mean when the data is symmetrically distributed without outliers.

Front

When should you use the median as a measure of center?

Back

Use the median when the data is skewed or contains outliers.

Front

What does it mean if the mean is greater than the median?

Back

It indicates that the data set is positively skewed, with higher values pulling the mean up.

Front

What does it mean if the mean is less than the median?

Back

It indicates that the data set is negatively skewed, with lower values pulling the mean down.