Quartiles of a Data Set

First Quartile is

• also called the upper quartile.
• a value that is much higher or much lower than the other values in a set of data.
• also called the lower quartile.
• the value appearing at the center of a set of data that has been sorted in numerical order.

Third Quartile is

• a measure used to describe the distribution of data.
• also called the upper quartile.
• also called the lower quartile.
• the sum of the numbers in a set of data divided by the number of pieces of data.

Find the lower quartile of the following set of scores:

12, 9, 4, 6, 5, 8, 9, 4, 10, 2

• 10

• 4

• 9

• 6

What is the value of Q3?
1, 3, 4, 5, 6, 8, 11, 13, 17

• 4
• 11
• 3.5
• 12

33, 25, 42, 25, 31, 37, 46, 29, 38
What is the third quartile (UQ) of the data?

• 37
• 38
• 40
• 46

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

• Lower Quartile

• Upper Quartile

• Median

• Maximum

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

• Upper Quartile

• Lower Quartile

• Median

• Minimum

What is the upper quartile (Q3) of the data set?

• 50
• 35
• 30
• 25

The median of the lower half of a data set; also called the lower quartile.

• second quartile
• third quartile
• first quartile
• interquartile range

Find the lower quartile of the following set of scores:

12, 9, 4, 6, 5, 8, 9, 4, 10, 2

• 10

• 4

• 9

• 6