scatter plots and trend lines

Front

What is a scatter plot?

Back

A scatter plot is a graph that shows the relationship between two quantitative variables by displaying data points on a two-dimensional axis.

Front

What does a trend line represent in a scatter plot?

Back

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

Front

How do you calculate the slope of a line?

Back

The slope of a line is calculated by taking the difference in the y-values divided by the difference in the x-values between two points on the line.

Front

What does a positive slope indicate?

Back

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

Front

What does a negative slope indicate?

Back

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

Front

What is the meaning of a slope of -5/7?

Back

A slope of -5/7 means that for every 7 units increase in the x-variable, the y-variable decreases by 5 units.

Front

What does 'no correlation' mean in a scatter plot?

Back

'No correlation' means that there is no apparent relationship between the two variables being plotted.

Front

How can you identify a strong correlation in a scatter plot?

Back

A strong correlation is identified when the data points are closely clustered around the trend line.

Front

What is the purpose of a trend line?

Back

The purpose of a trend line is to summarize the relationship between variables and make predictions based on the data.

Front

What does it mean if a scatter plot shows an upward trend?

Back

An upward trend in a scatter plot indicates that as one variable increases, the other variable tends to increase as well.