Title: Variables and Frequency tables
Course: 2024 Math 5° (reference) > Section: 6 november - 12 november

Types of Variables

A qualitative variable is a description or a characteristic of a population or sample.

For example, hair color or a favorite sport are qualitative variables.

A quantitative variable is a numerical characteristic of a population or sample.

For example, age or height are quantitative variables.

Watch the video:

Question 1

What type of variable will you classified "Weight" in a study of people.

- Quantitative Variable
Feedback: Correct! because it can be represented with numbers.
- Qualitative Variable.
Feedback: Incorrect! Remember that Weight is represented with numbers. 60kg, 45 kg, etc...

Question 2

What type of variable will you classified "Fruit" in a study about favorite fruite.

- Qualitative Variable
Feedback: Correct!!! Because "fruits" cannot be represented with numbers.
- Quantitative variable
Feedback: Incorrect, "fruits" cannot be represented with numbers.

Frequency Tables

Frequency tables are used to collect a wide range of numbers in a data set.

When grouping data:
1. All intervals are the same
2. There should be between 5 to 20 intervals.
3. There should be no gaps between the intervals.

What the video to learn how to make a frequency table:

Exercise of a frequency table

Mrs Jenson collected the results from 20 math tests. She wrote the results like this.

21, 27, 31, 6, 44, 26, 18, 5, 17, 25, 43, 22, 19, 11, 10, 20, 31, 41, 0, 7

In your notebook, simplify the results and group them in the frequency table.

** you need your table complete to answer the next questions.**

Math test results
Score | Tally | Frequency
0 to 9 |  |
10 to 19 |  |
20 to 29 |  |
30 to 39 |  |
40 to 49 |  |

Mrs Jenson Frequency table

Math test results
Scores | Tally | Frequency
0 to 9 | IIII | 4
10 to 19 | IIII | 5
20 to 29 | IIII  I | 6
30 to 39 | II | 2
40 to 49 | III | 3

Frequency table question 1

How many tests did Mrs. Jenson graded?

- 20
Feedback: Correct
- 15
Feedback: Incorrect!! go back and check your frequency table.
- 17
Feedback: Incorrect!! go back and check your frequency table.

Frequency table question 2

The pass score was 30. How many students passed the test?

- 5
Feedback: Correct!!! There are 5 students with grades equal or greater than 30!
- 2
Feedback: Incorrect!! you have to count all the students that have greater than 30.
- 3
Feedback: Incorrect!! you have to count all the students that have greater than 30.

Frequency table question 3

How many students had a grade between 20 to 29?

- 6
Feedback: Correct
- 5
Feedback: Incorrect!
- 4
Feedback: Incorrect!

Summary

This is the end of the lesson.