Trend lines

Front

What is a trend line?

Back

A trend line is a straight line that best represents the data on a scatter plot, showing the general direction of the data points.

Front

How can a trend line be used to make predictions?

Back

A trend line can be extended to estimate values not directly measured in the data set, allowing predictions based on the established relationship.

Front

What does a positive correlation indicate?

Back

A positive correlation indicates that as one variable increases, the other variable also increases.

Front

What does a negative correlation indicate?

Back

A negative correlation indicates that as one variable increases, the other variable decreases.

Front

What does it mean if there is no correlation between two variables?

Back

No correlation means that there is no predictable relationship between the two variables; changes in one do not affect the other.

Front

What is the correlation coefficient?

Back

The correlation coefficient is a numerical measure of the strength and direction of a relationship between two variables, ranging from -1 to 1.

Front

How do you interpret a correlation coefficient of 0.8?

Back

A correlation coefficient of 0.8 indicates a strong positive correlation between the two variables.

Front

What is the purpose of a scatter plot?

Back

A scatter plot visually represents the relationship between two quantitative variables, helping to identify trends or correlations.

Front

If a trend line predicts 14 chapters for a book with 140 pages, what does this imply?

Back

It implies that based on the data, a book with 140 pages is expected to have approximately 14 chapters.

Front

What is the difference between correlation and causation?

Back

Correlation indicates a relationship between two variables, while causation implies that one variable directly affects the other.