Year 9 Graphs And Charts

Question 1

Find missing number from a pie chart with no chart values given

Answer 1

360 / Total
Then Measured angle / Answer

Question 2

What axis does unit of time go

Answer 2

X - axis

Question 3

Calculate percentage of a pie chart sector

Answer 3

Angle of the sector / 360
Then multiply that by 100

Question 4

Line graphs vs scatter graphs

Answer 4

A Line Graph is ideal for showing growth rates or trends at even intervals.
Line graphs show data over time

A Scatter is best in displaying relationships between varying variables.

Question 5

Scatter graph with positive correlation

Answer 5

x x
| x x x
| xx
| x x x x
| x x
| x
———————————

Question 6

Scatter graph with negative correlation

Answer 6

|x x
| x x x x
| x x x
| x x
| x x x x
| x x
———————————

Question 7

Scatter graph with no correlation

Answer 7

|x x x x x x
| x x x x x x x
|x x x x x
| x x x x x
|x x x x x
| x x x x x
———————————

Question 8

How to draw a line of best fit on a scatter graph

Answer 8

Does not have to touch the x or y axis
Does not need to go through every point
There should be equal number of marks either side of it