Review of scatterplots

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 axis.

Front

What does a positive correlation in a scatterplot 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 scatterplot indicate?

Back

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

Front

What does it mean if a scatterplot shows no correlation?

Back

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

Front

What is the purpose of the line of best fit in a scatterplot?

Back

The line of best fit is used to summarize the relationship between the variables and can help predict values.

Front

How do you identify outliers in a scatterplot?

Back

Outliers are data points that fall far away from the general pattern of the other points in the scatterplot.

Front

What is the difference between a bar graph and a scatterplot?

Back

A bar graph displays categorical data with rectangular bars, while a scatterplot displays quantitative data to show relationships between two variables.

Front

What is the median in a data set?

Back

The median is the middle value when the numbers are arranged in order from least to greatest.

Front

How do you calculate the mean of a data set?

Back

To calculate the mean, add all the numbers in the data set and divide by the total number of values.

Front

What is the interquartile range (IQR)?

Back

The IQR is the difference between the third quartile (Q3) and the first quartile (Q1) and measures the spread of the middle 50% of the data.