# AP Statistics : How to interpret dotplots

## Example Questions

### Example Question #1 : How To Interpret Dotplots

A basketball coach wants to determine if a player's height can be used to predict the number of points that player scores in a season.  Before using a statistical test to determine the precise relationship of the variables, the coach wants a visual of the data to see if there is likely to be a relationship.  Which of the following should the coach create?

Bar chart

Bell curve

Histogram

Scatterplot

Z-score

Scatterplot

Explanation:

A scatterplot is a diagram that shows the values of two variables and provides a general illustration of the relationship between them.

### Example Question #1 : Using Scatter Plots

Based on the scatter plot below, is there a correlation between the  and  variables? If so, describe the correlation.

Yes; positive linear relationship

Yes; negative exponential relationship

No; there is no correlation

Yes; negative linear relationship

Yes; negative linear relationship

Explanation:

The data points follow an overall linear trend, as opposed to being randomly distributed. Though there are a few outliers, there is a general relationship between the two variables.

A line could accurately predict the trend of the data points, suggesting there is a linear correlation. Since the y-values decrease as the x-values increase, the correlation must be negative. We can see that a line connecting the upper-most and lower-most points would have a negative slope.

An exponential relationship would be curved, rather than straight.

### Example Question #3 : How To Interpret Dotplots

Order the correlation coefficients to fit the order of the following graphs (two coefficients will not be used)

,  , ,  ,

, ,

,  ,

, ,

, ,

,  ,