# Lines of best fit

## Lesson details

### Key learning points

1. In this lesson, we will learn how to draw lines of best fit on scatter graphs, and we will invesitgate the purpose of lines of best fit.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

## Video

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## Worksheet

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## Starter quiz

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### 4 Questions

Q1.
What type of correlation does the following graph show?
Negative correlation
No correlation
Q2.
With which of these two variables would you expect to see negative correlation?
Correct answer: Amount of flu jabs and percentage of people getting the flu
Number of hours studied and score in a test
Number of sandwiches made and cost to make them
Score in an IQ test and amount of tea drunk
Q3.
With which of these two variables would you expect to see no correlation?
Amount of flu jabs and percentage of people getting the flu
Number of hours studied and score in a test
Number of sandwiches made and cost to make them
Correct answer: Score in an IQ test and amount of tea drunk
Q4.
What variables could go on this graph?
Air conditioning bill on the x axis and heating bill on the y axis
Air conditioning bill on the x axis and temperature on the y axis
Temperature on the x axis and air conditioning bill on the y axis
Correct answer: Temperature on the x axis and heating bill on the y axis

## Exit quiz

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### 3 Questions

Q1.
Which of the following is the most appropriate line of best fit for the data?
Option 1
Option 2
Option 4
Q2.
The scatter graph below shows the shoe size and height of different secondary students. If a student had a shoe size of 6, what would you expect their height to be?
150cm
170cm
It would be unreliable to make an estimate
Q3.
Thinking about the scatter graph above, which of the statements would you agree with the LEAST? Select one.
Correct answer: Someone who is 190cm tall would have a shoe size of 13
The shorter you are, the smaller your feet are likely to be.
There is a positive correlation between shoe size and height
Two students had a shoe size of 8