Quartiles and Interquartile Range

The median is always equal to one of the values in the data set.

• True

• False

In a data set with 25 different values, if you change the two smallest values in the data set to smaller values, the median will not be changed.

• True

• False

What do quartiles split data up into?

• halves

• thirds

• fourths

• fifths

What is an interquartile range?

• The difference between the upper and lower quartiles.

• The mean of the data set.

• The average of a data set

• All of the above

What is the first step to take when attempting to find IQR?

• Find the lower and upper quartile.

• Find the median.

• Put the list of numbers in order.

• Subtract the lower and upper quartile.

The table shows the average monthly temperature for St. Louis. The median for this data is ________.

The table shows the average monthly temperature for St. Louis. The lower quartile (Q1) for this data is ______.

The table shows the average monthly temperature for St. Louis. The upp er quartile (Q3) for this data is ______.

An outlier is a number in a list that is much bigger than or much smaller than the rest of the numbers in the list. It just seems out of place. True or False

• True

• False

What is represented by the box in a box plot?

• Q1

• Median

• Q3

• All the above