Decoding Box Plots

This video tutorial explains how to read and interpret box plots, also known as box and whisker graphs. It covers the concept of quartiles and how data is divided into four equal parts. The tutorial uses examples of test scores, student heights, and egg laying by hens to demonstrate how to identify the maximum, minimum, median, and quartile values in a dataset. It emphasizes that each section of a box plot represents 25% of the data, and clarifies common misconceptions about data distribution in box plots.

What does a boxplot primarily divide data into?

• Ten deciles

• Two halves

• Five quintiles

• Four quarters or quartiles

What was the highest score obtained in the test?

• 100

• 89

• 77

• 94

What score range did the middle 50% of students achieve?

• 94 to 100

• 80 to 90

• 80 to 89

• 77 to 80

What was the lowest score on the exam?

• 77

• 80

• 89

• 100

What was the median height of the students, in inches?

• 66

• 61

• 70

• 56

Is it true that at least 75% of the students are taller than 60 inches?

• Cannot be determined

• True

• Only 50% are taller

• False

What percentage of students are between 66 and 69 inches tall?

• 100%

• 75%

• 50%

• 25%

What is the first quartile height of the students, in inches?

• 70

• 56

• 61

• 66

How many eggs did the majority of hens lay?

• Between 15 and 18

• More than 24

• Between 6 and 15

• Between 18 and 24

Is it correct that 50% of the hens laid 18 eggs or more?

• False

• All hens did

• True

• Only 25% did