Correlation Statistics

The scatter graph shows the relationship between the two test scores of some students.

One student missed Test 2 and scored 120 marks on Test 1. Use the graph to estimate their result for Test 2

• 60

• 20

• 120

• 160

The scatter graph shows the relationship between the two test scores of some students.

One student missed Test 1 and scored 90 marks on Test 2. Use the graph to estimate their result for Test 1.

• 60

• 90

• 120

• 160

The scatter graph shows the relationship between the amount of rainfall and the number of umbrellas sold each day.

On another day, 30 umbrellas were sold. Estimate the amount of rainfall for that day.

• 5

• 10

• 12

• 8

Using the line of best fit. If a student had a handspan of 20.5 cm, the estimation height will be 160 cm. True or False?

• True

• False

Using the line of best fit. If a student had a height of 146 cm, the estimated handspan will be 17 cm. True or False?

• True

• False

What type of correlation is shown?

Which graph has a weak and positive correlation?

• 
• 
• 
• 

What is a line of best fit used for?

• To make predictions

• To connect the points

• To make the graph look pretty

• To make it look like you know what you are doing

The scatterplot below suggests which of the following types of data relationship?

• Weak and Negative

• Weak and Positive

• Strong and Negative

• Strong and Positive

The scatter graph shows the relationship between the height and arm span of some students.

Another student has a height of 145 cm. Use the graph to estimate their arm span.

• 140 cm

• 120 cm

• 110 cm

• 180 cm