Measures of Variability

Front

What is the median of the lower half of a data set?

Back

Q1 (Lower Quartile)

Front

What is an outlier in a data set?

Back

A value that is much greater or much less than most of the other values.

Front

What percent of students have a height between 58 inches and 60 inches if the data is normally distributed?

Back

25%

Front

What is the term for the median of the upper half of the data?

Back

Q3 (Upper Quartile)

Front

What is the standard deviation of the data set: 8, 8, 8, 8, 8, 8, 8, 8, 8?

Back

0

Front

What does Q1 represent in a data set?

Back

The first quartile, or the median of the lower half of the data.

Front

What does Q3 represent in a data set?

Back

The third quartile, or the median of the upper half of the data.

Front

How do you calculate the interquartile range (IQR)?

Back

IQR = Q3 - Q1.

Front

What is the purpose of measures of variability?

Back

To describe the spread or dispersion of a data set.

Front

What is the range of a data set?

Back

The difference between the maximum and minimum values.