Correlation and Correlation Coefficient

Estimate the correlation coefficient for this scatterplot. (a)  

• A) r = 1.2
• B) r = 0.89
• C)r = 0
• D) r = -0.89

Estimate the correlation coefficient for this scatterplot.

• A) r = -0.9

• B) r = 1

• C) r = 0.9

• D) r = -1

Tags

CCSS.8.SP.A.1

CCSS.8.SP.A.2

What type of correlation does this graph show?

• A) Positive

• B) negative

• C) none

• D) all of the above

Tags

CCSS.8.SP.A.1

Which quality below do we NOT use when describing the relationship between two quantitative variables (a)  

• Direction
• Form
• Strength
• Spread

As x increases, y decreases.

• A) no correlation

• B) negative correlation

• C) correlation coefficient

• D) positive correlation

Tags

CCSS.HSF-LE.A.1B

The scatter plot below shows the number of books read by students in Mrs. Hall’s English class and their final grades. Which statement represents the best description about the line of best fit?

• A) The more books students read, the lower their English grade.

• B) The more books students read, the higher their English grade.

• C) The fewer books students read, the higher their English grade.

• D) No relationship exists between the number of books students read and their English grades.

Tags

CCSS.HSF.LE.B.5

The scatter plot shows the number coffee shops in different cities and the number of violent crimes. Which of the following is NOT true?

• A) As the number of coffee shops increase, violent crimes appears to increase.

• B) The line of best fit (regression line) shows a positive correlation

• C) The data has a positive correlation coefficient

• D) An increase in coffee shops causes an increase in violent crimes

Tags

CCSS.HSF-LE.A.1B

A perfect positive correlation has a correlation coefficient of ____. 

Mathematical Equivalence

ON

Which graph depicts the strongest positive correlation?

• 
• 
• 
• 

What is the correlation coefficient of the data characteristics shown?

• -.928

• .928

• .861

• -.861