Scatter Plots and Trend Lines Review

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 line of best fit represent in a scatter plot?

Back

The line of best fit represents the trend in the data, showing the general direction that the data points follow.

Front

How do you determine the slope of a trend line?

Back

The slope of a trend line is determined by the change in the y-values divided by the change in the x-values between two points on the line.

Front

What is a positive association in a scatter plot?

Back

A positive association means that as one variable increases, the other variable also tends to increase.

Front

What is a negative association in a scatter plot?

Back

A negative association means that as one variable increases, the other variable tends to decrease.

Front

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

Back

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

Front

How can you use a trend line to make predictions?

Back

You can use a trend line to predict values by finding where a specific x-value intersects the trend line and reading the corresponding y-value.

Front

What are ordered pairs in the context of scatter plots?

Back

Ordered pairs are pairs of numbers that represent the coordinates of points on a scatter plot, typically written as (x, y).

Front

What is the purpose of identifying outliers in a scatter plot?

Back

Outliers are data points that differ significantly from other observations; identifying them helps in understanding the overall trend and accuracy of predictions.

Front

What is the formula for calculating the slope of a line?

Back

The formula for slope (m) is m = (y2 - y1) / (x2 - x1), where (x1, y1) and (x2, y2) are two points on the line.