Scatterplots and trendlines

Front

What is a scatterplot?

Back

A scatterplot is a graph that shows the relationship between two quantitative variables by displaying data points on a two-dimensional grid.

Front

What does a trendline represent in a scatterplot?

Back

A trendline, or line of best fit, represents the general direction or pattern of the data points in a scatterplot.

Front

What does a positive correlation indicate?

Back

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

Front

What does a negative correlation indicate?

Back

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

Front

What is the mean?

Back

The mean is the average of a set of numbers, calculated by adding all the values together and dividing by the number of values.

Front

How can you identify a strong positive correlation in a scatterplot?

Back

A strong positive correlation is identified when the data points closely follow a straight line that slopes upwards from left to right.

Front

What is the purpose of the line of best fit?

Back

The line of best fit is used to predict values and understand the relationship between the variables in a scatterplot.

Front

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

Back

No correlation means that there is no apparent relationship between the two variables; the data points are scattered randomly.

Front

How do you determine the expected value from a scatterplot?

Back

To determine the expected value, locate the x-value on the horizontal axis and find the corresponding y-value on the trendline.

Front

What is the difference between mean, median, and mode?

Back

Mean is the average, median is the middle value when data is ordered, and mode is the most frequently occurring value.