Statistics and Graphing Concepts

This video tutorial covers Unit 8 Lesson 15 on quartiles and interquartile range. It begins with an explanation of quartiles using a data set example, followed by an analysis of word game scores using quartiles and IQR. The tutorial then matches dot plots with medians and IQRs for students from different countries. It compares the variability of bowling scores using IQR and provides instructions for plotting points on a graph. Finally, it demonstrates solving for unknowns using percentages and fractions.

How many values are between the first and third quartile in a data set of 20 different numbers?

• 10

• 5

• 15

• 20

In a data set of 20 numbers, how many values are between the first quartile and the median?

• 3

• 5

• 7

• 9

What is the median score in the word game dot plot?

• 6.5

• 6

• 7

• 5.5

What is the first quartile (Q1) in the word game dot plot?

• 7

• 6

• 5

• 4

What is the third quartile (Q3) in the word game dot plot?

• 7

• 10

• 8

• 9

How do you calculate the interquartile range (IQR)?

• Q3 * Q1

• Q1 - Q3

• Q3 - Q1

• Q3 + Q1

What is the interquartile range if Q3 is 8 and Q1 is 5?

• 2

• 3

• 4

• 5

Which country's dot plot has a median of 8?

• South Africa

• United States

• Canada

• Australia

Which country's dot plot has an IQR of 30?

• South Africa

• Australia

• Canada

• United States

Which country's dot plot has a median of 17.5?

• New Zealand

• Australia

• Canada

• United States