Quartiles and Interquartile Range

This lesson covers how to identify the maximum, minimum, and quartiles in a data set. It explains the process of arranging data in numerical order to find these values. The video also details how to calculate the interquartile range by subtracting the lower quartile from the upper quartile. Key concepts such as the median and the significance of quartiles in dividing data into equal parts are discussed.

What is the role of quartiles in a data set?

• They identify the largest and smallest numbers.

• They determine the range of the data set.

• They calculate the average of the data set.

• They divide the data set into four equal parts.

How do you determine the maximum value in a data set?

• By finding the average of all numbers.

• By identifying the smallest number.

• By arranging the data in numerical order and selecting the largest number.

• By calculating the difference between the largest and smallest numbers.

What is the median in a data set?

• The smallest number in the data set.

• The largest number in the data set.

• The middle number when the data set is arranged in order.

• The average of all numbers in the data set.

How is the lower quartile determined?

• By identifying the smallest number in the data set.

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

• By calculating the average of the lower half of the data set.

• By finding the middle number of the entire data set.

What is the interquartile range (IQR)?

• The difference between the maximum and minimum values.

• The sum of the upper and lower quartiles.

• The difference between the upper and lower quartiles.

• The average of the upper and lower quartiles.