Scatter Plots Correlation Coefficient

What is a scatter plot?

• A graph that shows a relationship between two sets of data

• A line that represents the equation of a straight line

• A measure of how closely the points in a scatter plot cluster around the line of best fit

• Data that involves two variables

What does a correlation coefficient describe?

• The strength of the relationship between two sets of data

• The equation of a straight line

• The amount of scatter in a scatter plot

• The number of variables in bivariate data

What does a positive correlation indicate?

• Both sets of data values increase together

• One set of data increases as the other set decreases

• There is no relationship between the two sets of values

• The scatter plot is scattered all over the place

What does a negative correlation indicate?

• Both sets of data values increase together

• One set of data increases as the other set decreases

• There is no relationship between the two sets of values

• The scatter plot is scattered all over the place

What type of correlation does this graph have?

• positive

• negative

• none

• all of the above

Describe the relationship between the variables.

• Weak negative correlation

• Moderate negative correlation

• Moderate positive correlation

• Strong negative correlation

Describe the relationship between the variables.

• Weak positive correlation

• Weak negative correlation

• Strong positive correlation

• Strong negative correlation

Match the scatterplot to the correlation:

• r=-0.344

• 
• r=0.765

• 
• r=0.304

• 
• r=-0.969

• 

Match the following correlation coefficients to the appropriate description.

• -0.9

• Negative, Weak

• -0.12

• Positive, Moderate

• -0.3

• Positive, Strong

• 0.64

• Negative, Very Weak

• 0.41

• Negative, Very strong

The correlation is always a number between ​ (a)   and​ (b)  

• -1

• 1

• 100

• -100

• 10

• -10