Scatter Plots and Trend Lines

Front

What is a scatter plot?

Back

A scatter plot is a graph that shows the relationship between two variables by displaying data points on a two-dimensional axis.

Front

What is a trend line?

Back

A trend line is a straight line that best represents the data on a scatter plot, indicating the general direction of the data points.

Front

How do you interpret a positive correlation in a scatter plot?

Back

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

Front

How do you interpret a negative correlation in a scatter plot?

Back

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

Front

What does it mean if there is no correlation between two variables?

Back

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

Front

What is the line of best fit?

Back

The line of best fit is the trend line that minimizes the distance between itself and all the data points in a scatter plot.

Front

How can you use a trend line to make predictions?

Back

You can use a trend line to estimate the value of one variable based on the value of another variable by finding the corresponding point on the line.

Front

What does a slope of -5/7 indicate in a real-world context?

Back

A slope of -5/7 indicates that for every 7 units of one variable, the other variable decreases by 5 units.

Front

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

Back

Scatter plots are used to visually assess the relationship between two quantitative variables and identify trends or patterns.

Front

What is the difference between a strong correlation and a weak correlation?

Back

A strong correlation means the data points are closely clustered around the trend line, while a weak correlation means they are more spread out.