Quartiles and Interquartile Range

Front

What is an outlier in a data set?

Back

A value that is much higher or much lower than the other values in a set of data.

Front

What is the first step to take when attempting to find the interquartile range (IQR)?

Back

Put the list of numbers in order.

Front

What is the interquartile range (IQR) of the data set: 3, 5, 6, 6, 7, 8, 9?

Back

3

Front

How do you calculate the interquartile range (IQR)?

Back

IQR = Q3 - Q1, where Q3 is the upper quartile and Q1 is the lower quartile.

Front

What is the median of a data set?

Back

The median is the middle value when the numbers are arranged in order.

Front

True or False: The median is the midpoint between the smallest and largest values in the data set.

Back

False. The median is the middle value, not the average of the smallest and largest.

Front

What does Q1 represent in a data set?

Back

Q1 is the first quartile, which is the median of the lower half of the data.

Front

What does Q3 represent in a data set?

Back

Q3 is the third quartile, which is the median of the upper half of the data.

Front

If the minimum is 1, Q1 is 3, median is 5, Q3 is 7, and maximum is 9, what is the IQR?

Back

4 (IQR = Q3 - Q1 = 7 - 3).

Front

What is a box plot?

Back

A graphical representation of the distribution of a data set that shows the minimum, Q1, median, Q3, and maximum.