General Maths Week 14/15 Regression Quiz

What is bivariate data?

• Data consisting of a single set of numerical data

• Data consisting of two sets of individual numerical data

• Data consisting of a single set of categorical data

• Data consisting of two sets of categorical data

Identify the type of correlation in this scatterplot.

• Weak positive correlation

• No correlation

• Weak negative correlation

• Strong negative correlation

What does a positive correlation indicate?

• As the explanatory variable increases, the response variable decreases

• The points form a perfect line

• There is no relationship between the variables

• As the explanatory variable increases, the response variable also increases

Which of the following best describes a strong, positive, linear correlation?

• The points are closely clustered in a manner that suggests a linear relationship

• The points form a perfect line

• The points are widely scattered with no clear pattern

• The points form no trend at all

In the given example, what is the explanatory variable?

• Height of the plants

• Number of weeks

• Weekly amount of fertiliser

• Type of plant

Predicting a y value from within the range of x values is called:

• prediction

• interpolation

• extrapolation

• interpretation

Predicting a y value from outside the range of x values is called

• prediction

• interpolation

• extrapolation

• interpretation

If we are interpolating and the correlation is strong, the predication will be

• reliable

• unreliable

If we are interpolating and the correlation is moderate or weak (rather than strong), the predication will be

• very reliable

• less reliable

• unreliable

• very unreliable

If we are extrapolating, the predication is usually

• reliable

• unreliable