Correlation Math

The correlation coefficient, is always between ___ and ___.

• 0 and 1

• -1 and 1 

• -1 and 0

• 0 and 10

Can you guess the correlation?

• Positive

• Negative

• None

Guess the correlation between the variables:

• Positive

• Negative

• None

What type of association does this scatter plot represent?

• positive linear association

• negative linear association

• no association

• nonlinear association

Does this scatter plot show a positive trend, a negative trend, or no trend?

• positive trend

• negative trend

• no trend

Estimate the correlation coefficient.

• r is close to zero

• r is close to -1

• r is close to 1

• r is close to -1.5

• r is close to 1.5

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books.  Use the trend line to predict how many chapters would be in a book with 180 pages. 

• 12 chapters

• 15 chapters

• 18 chapters

• 21 chapters

Which of the following lines represents the line of best fit for the scatter plot?

• A

• B

• C

• There is no line of best fit for this graph because there is no trend.

Which of the following represents the STRONGEST correlation?

• -.03

• +.5

• +.03

• -.79

What type of correlation?
The temperature outside and the amount of ice cream sales. 

• Positive correlation

• Negative correlation

• No correlation