Unit 15 Day 3

Front

What is correlation?

Back

Correlation is a statistical measure that describes the extent to which two variables change together. It can be positive, negative, or no correlation.

Front

What does positive correlation mean?

Back

Positive correlation means that as one variable increases, the other variable also increases.

Front

What does negative correlation mean?

Back

Negative correlation means that as one variable increases, the other variable decreases.

Front

What does no correlation mean?

Back

No correlation means that there is no predictable relationship between the changes in two variables.

Front

Give an example of positive correlation.

Back

An example of positive correlation is the relationship between the age of a tree and its height; as the tree gets older, it generally grows taller.

Front

Give an example of negative correlation.

Back

An example of negative correlation is the relationship between outside temperature and the number of layers of clothing worn; as the temperature increases, the number of layers typically decreases.

Front

Give an example of no correlation.

Back

An example of no correlation is the relationship between a person's age and the number of siblings they have; age does not affect the number of siblings.

Front

What is a scatter plot?

Back

A scatter plot is a graph that uses dots to represent the values obtained for two different variables, showing the relationship between them.

Front

What is a line of best fit?

Back

A line of best fit is a straight line that best represents the data on a scatter plot, indicating the trend of the data.

Front

How do you determine the correlation from a scatter plot?

Back

You determine the correlation by observing the direction and pattern of the dots; if they trend upwards, it's positive; if downwards, it's negative; if scattered randomly, it's no correlation.