Looking for patterns, trends and correlations in data

Look at the data that has been taken in the following experiments. Variable A is changed. Variable B is measured.

Question

Describe the relationship between the variables.

A graph with the x axis labelled A and the y axis labelled B. A line runs upwards diagonally from the origin.

B is directly proportional to A. Both A and B start from zero and both increase by regular amounts in proportion to each other.

Question

Describe the relationship between the variables.

A graph with the x axis labelled A and the y axis labelled B. A line runs upwards diagonally from a point on the y axis.

B is proportional to A. B increases by the same amount (3) each time A increases by 1.

Question

Describe the relationship between the variables.

A graph with the x axis labelled A and the y axis labelled B. A curved line runs horizontally from the origin and rises upwards.

There is a positive correlation between A and B. As A increases, B increases at an increasing rate.