Understanding Quartiles and Interquartile Range

What is the first step in identifying the maximum and minimum values in a data set?

• Calculate the average of the data set.

• Arrange the data set in numerical order.

• Find the median of the data set.

• Identify the mode of the data set.

Which quartile represents the median of a data set?

• First quartile

• Second quartile

• Third quartile

• Fourth quartile

How is the lower quartile determined in a data set?

• By finding the average of the entire data set.

• By calculating the difference between the maximum and minimum values.

• By identifying the smallest value in the data set.

• By finding the middle number of the lower half of the data set.

What is the interquartile range (IQR) of a data set?

• The sum of the upper and lower quartiles.

• The difference between the upper and lower quartiles.

• The average of the upper and lower quartiles.

• The product of the upper and lower quartiles.

If the upper quartile is 8 and the lower quartile is 3, what is the interquartile range?

• 11

• 5

• 8

• 3