Bivariate Data Analysis

Which of the following scatterplots shows weak negative correlation?

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The equation of a regression line that enables weekly amount spent on entertainment (in dollars) to be predicted from weekly income is given by:
amount = 0.10 x income + 40
What is the predicted amount spent on entertainment with a weekly income of $600?

• $40

• $46

• $100

• $240

The scatterplot shows the navel height and the body height for nine students.

What has been plotted as the independent variable?

__________________________.

Answer explanation

The independent variable is always on the x-axis.

The scatterplot shows the navel height and the body height for nine students.

What has been plotted as the dependent variable?

__________________________.

Answer explanation

The dependent variable is always on the y-axis.

The scatterplot shows the navel height and the body height for nine students.

Is the association between these two variables linear or non-linear?

The scatterplot shows the navel height and the body height for nine students.

Describe the association as strong, moderate or weak.

The scatterplot shows the navel height and the body height for nine students.

What is the body height for the student with a navel height of 112 cm?

Answer explanation

Don't forget your units!

The scatterplot shows the navel height and the body height for nine students.

What is the navel height for the student with a body height of 166 cm?

Answer explanation

Don't forget your units!

The scatterplot shows a student’s height (in cm) and their age (in years). What is the height for the student whose age is 11 years?

The scatterplot shows a student’s height

(in cm) and their age (in years).

State whether the association is

positive or negative.