Finding Quartiles in Odd Data Sets

What is the purpose of quartiles in data analysis?

• To divide data sets into three equal parts

• To divide data sets into four equal parts

• To find the average of a data set

• To identify the highest value in a data set

Which quartile represents the 25th percentile?

• Lower quartile

• Median

• None of the above

• Upper quartile

What does the median (Q2) represent in a data set?

• The 25th percentile

• The 50th percentile

• The highest value

• The 75th percentile

In a data set with nine numbers, which number represents the median?

• The 9th number

• The 3rd number

• The 7th number

• The 5th number

What is the first step in finding the median of a data set?

• Dividing the data into two halves

• Identifying the highest value

• Finding the average

• Ordering the data from least to greatest

How do you find the lower quartile (Q1) in a data set?

• By finding the highest value in the data set

• By finding the median of the entire data set

• By finding the average of the data set

• By finding the median of the lower half of the data set

If the lower half of a data set has an even number of numbers, how do you find the lower quartile?

• By taking the highest number in the lower half

• By taking the average of the two middle numbers

• By taking the lowest number in the lower half

• By taking the sum of all numbers in the lower half

What is the lower quartile (Q1) if the two middle numbers in the lower half are 2 and 4?

• 4

• 5

• 3

• 2

How do you find the upper quartile (Q3) in a data set?

• By finding the average of the data set

• By finding the median of the upper half of the data set

• By finding the median of the entire data set

• By finding the lowest value in the data set

What is the upper quartile (Q3) if the two middle numbers in the upper half are 10 and 14?

• 16

• 10

• 12

• 14