euro maths scatter graphs

Question 1

what are scatter graphs used for ?

Answer 1

to check if there’s a correlation between the data sets/ if the two variables correlate

Question 2

correlation can be :

Answer 2

• positive or negative
• weak or strong
  ~ correlation doesn’t always imply causation
  ~sometimes, there is NO correlation

Question 3

the line of best fit :

Answer 3

• doesn’t have to pass through the origin
• is extending in the middle of the scatter graph
• follows the steepness of the scatter graph
  ~it can be used to find some estimates

Question 4

a linear equation

Answer 4

a linear equation always has the form:
y = mx + b
m represents the slope
b represents the y-intercept

Question 5

the slope

Answer 5

slope = rise/ run
rise is how much a line goes up or down
run is how much a line goes left or right

Question 6

voc scatter graphs

Answer 6

we need 2 sets of data
the origin
the x-axis
the y-axis
to plot a point
a scatter plot
to draw a line extending from a value