Scatter Plots

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 positive correlation in a scatter plot indicate?

Back

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

Front

What does a negative correlation in a scatter plot indicate?

Back

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

Front

What does no correlation mean in a scatter plot?

Back

No correlation means there is no apparent relationship between the two variables; changes in one variable do not predict changes in the other.

Front

How do you determine the slope of a trend line?

Back

The slope of a trend line is determined by the formula (change in y) / (change in x) between two points on the line.

Front

What is the formula for calculating slope using two points (x1, y1) and (x2, y2)?

Back

Slope (m) = (y2 - y1) / (x2 - x1).

Front

What does the y-intercept represent in a scatter plot?

Back

The y-intercept represents the value of y when x is zero; it is where the trend line crosses the y-axis.

Front

How can you estimate a value from a scatter plot?

Back

You can estimate a value by locating the corresponding x or y value on the plot and finding the point that aligns with it.

Front

What is the purpose of a trend line in a scatter plot?

Back

A trend line helps to visualize the overall direction of the data points and can be used to make predictions.

Front

What is an outlier in a scatter plot?

Back

An outlier is a data point that significantly differs from other observations, potentially indicating an anomaly.