Scatter Plots & Correlation Coefficients

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 does a correlation coefficient of -1 represent?

• A strong positive correlation

• A strong negative correlation

• No correlation

• A weak positive correlation

What does a correlation coefficient of 0 represent?

• A strong positive correlation

• A strong negative correlation

• No correlation

• A weak positive correlation

What does a correlation coefficient of 1 represent?

• A strong positive correlation

• A strong negative correlation

• No correlation

• A weak positive correlation

What does it mean when we say 'correlation does not mean causation'?

• A strong correlation always implies a cause-and-effect relationship

• A strong correlation never implies a cause-and-effect relationship

• A strong correlation sometimes implies a cause-and-effect relationship

• A strong correlation is always a result of causation

Identify the explanatory variable:

Age of students and whether they are allowed to stay up past 11:00PM on a school night.

• Age of Students

• Bedtime

• Day of the Week

• Parents' Education Level

Identify the response variable:

Age of students and whether they are allowed to stay up past 11:00PM on a school night.

• Age of Students

• Bedtime

• Day of the Week

• Parents' Education Level