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 relationship between the variables.

Front

How can you use a trend line to make predictions?

Back

You can use a trend line to predict values by finding the corresponding value on the line for a given input value.

Front

What is correlation in the context of scatter plots?

Back

Correlation refers to the strength and direction of a relationship between two variables, which can be positive, negative, or nonexistent.

Front

What does a positive correlation indicate?

Back

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

Front

What does a negative correlation indicate?

Back

A negative correlation indicates that as one variable increases, the other variable tends to decrease.

Front

What does 'no correlation' mean?

Back

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

Front

How do you determine the type of correlation from a scatter plot?

Back

You determine the type of correlation by observing the pattern of the data points: upward slope for positive, downward slope for negative, and random scatter for no correlation.

Front

What is the purpose of using scatter plots in data analysis?

Back

Scatter plots are used to visually assess relationships between variables, identify trends, and detect outliers.

Front

What is an example of using a scatter plot in real life?

Back

An example is using a scatter plot to analyze the relationship between study hours and exam scores among students.