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 the slope of a line represent in a scatter plot?

Back

The slope of a line in a scatter plot represents the rate of change between the two variables. It indicates how much one variable changes for a unit change in the other variable.

Front

How do you calculate the slope between two points (x1, y1) and (x2, y2)?

Back

The slope (m) is calculated using the formula: m = (y2 - y1) / (x2 - x1).

Front

What is a positive correlation in a scatter plot?

Back

A positive correlation occurs when an increase in one variable corresponds to an increase in the other variable, resulting in a line that slopes upwards.

Front

What is a negative correlation in a scatter plot?

Back

A negative correlation occurs when an increase in one variable corresponds to a decrease in the other variable, resulting in a line that slopes downwards.

Front

What does it mean if there is no correlation in a scatter plot?

Back

No correlation means that there is no discernible relationship between the two variables; the data points do not follow a clear pattern.

Front

What is the y-intercept of a line?

Back

The y-intercept is the point where the line crosses the y-axis, indicating the value of y when x is zero.

Front

How can you find the y-intercept from the equation of a line?

Back

In the equation y = mx + b, the y-intercept is represented by b.

Front

What is the x-intercept of a line?

Back

The x-intercept is the point where the line crosses the x-axis, indicating the value of x when y is zero.

Front

How do you find the x-intercept from the equation of a line?

Back

To find the x-intercept, set y to zero in the equation and solve for x.