Scatterplots

Front

What is a scatterplot?

Back

A scatterplot is a graph that displays values for typically two variables for a set of data. Each point on the graph represents an observation.

Front

What does a linear relationship in a scatterplot indicate?

Back

A linear relationship indicates that as one variable increases or decreases, the other variable tends to do the same in a consistent manner, forming a straight line when graphed.

Front

What is the purpose of using scatterplots in data analysis?

Back

Scatterplots are used to visually assess the relationship between two quantitative variables, helping to identify trends, correlations, and potential outliers.

Front

How can you predict values using a scatterplot?

Back

You can predict values by finding the trend line (line of best fit) on the scatterplot and using it to estimate the value of one variable based on the value of the other.

Front

What does it mean if a scatterplot shows no correlation?

Back

No correlation means that there is no discernible pattern or relationship between the two variables; the points are scattered randomly.

Front

What is the significance of outliers in a scatterplot?

Back

Outliers are data points that differ significantly from other observations. They can indicate variability in the data, measurement errors, or novel insights.

Front

What type of scatterplot would you expect when graphing temperature and beach visitors?

Back

You would expect a positive correlation scatterplot, where higher temperatures correlate with more beach visitors.

Front

How do you interpret the slope of a trend line in a scatterplot?

Back

The slope indicates the direction and steepness of the relationship between the two variables; a positive slope means that as one variable increases, the other does too.

Front

What is the x-axis and y-axis in a scatterplot?

Back

The x-axis is the horizontal axis representing the independent variable, while the y-axis is the vertical axis representing the dependent variable.

Front

What does a scatterplot with a negative correlation look like?

Back

A scatterplot with a negative correlation shows that as one variable increases, the other variable decreases, forming a downward slope.