Understanding Data Representation and Intervals

This tutorial explains how to create a bar graph using intervals to represent data effectively. It covers the importance of using intervals when the data range is large, how to calculate the range, and how to choose appropriate intervals. The tutorial provides step-by-step instructions for plotting the bar graph and analyzing the results to understand class performance.

What is the main objective of the tutorial?

• To learn how to create pie charts

• To understand intervals and bar graphs

• To analyze scatter plots

• To study line graphs

Why do we sometimes need to use intervals in data representation?

• To reduce the number of bars in the graph

• To avoid using a calculator

• To increase the complexity of the graph

• To make the graph look colorful

How do you find the range of the data?

• Multiply the highest and lowest numbers

• Subtract the lowest number from the highest number

• Divide the highest number by the lowest number

• Add the highest and lowest numbers

What is the range of the data in the example provided?

• 98

• 48

• 50

• 20

Why is 9.6 considered a good interval size in the example?

• Because it is close to 10, which is easy to count by

• Because it is an even number

• Because it is a prime number

• Because it is a multiple of 5

What is the starting point for the intervals in the example?

• 40

• 50

• 60

• 51

How many marks are there in the interval 50 to 59?

• 1

• 4

• 2

• 3

What is the next interval after 50 to 59?

• 62 to 71

• 59 to 68

• 60 to 69

• 61 to 70

Which interval had the highest number of marks in the example?

• 50 to 59

• 90 to 99

• 60 to 69

• 80 to 89

What should a teacher consider if the highest bar is in the 50 to 59 range?

• The teacher should give more homework

• The teacher should re-teach the material

• The class needs a break

• The class did very well