Scatterplots

Scatterplots

Multiple Choice

What type of relationship does this graph have?

• Positive 
• Negative
• No Relationship
• Constant

Multiple Choice

What type of relationship does this graph show?

• Positive
• Negative
• No Relationship
• Constant 

Multiple Choice

Which graph shows a line of best fit for the scatter plot?

• Graph A

• Graph B

• Graph C

• Graph D

Multiple Choice

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

Multiple Choice

Based on this scatterplot, approximate what score should a student who attended class 22 days expect to receive on the exam?

• 84

• 71

• 95

• 75

Multiple Choice

What is the equation of the line of best fit

• y= -2x + 10

• y= 10x+ 2

• y=2x+10

• y= 10

Multiple Choice

What is the equation of the line of best fit?

• y= $$-\frac{1}{2}x\ +\ 6$$

• y= $$\frac{1}{2}x\ +6$$

• y= 6x + 2

• y = -2x +6

Multiple Choice

Describe the correlation, if the correlation coefficient is r = -0.26

• Positive, weak

• Negative, weak

• Positive, strong

• Negative, strong

Multiple Choice

Estimate the correlation coefficient for this scatterplot.

• A) r = -0.9

• B) r = 1

• C) r = 0.9

• D) r = -1

Multiple Choice

Estimate the correlation coefficient for this scatterplot.

• A) r = 1.2

• B) r = 0.89

• C)r = 0

• D) r = -0.89

Multiple Choice

Average time spent listening to music per day and average time spent watching TV per day.  $$r=-.17$$  

• strong positive

• strong negative

• weak positive

• weak negative

Multiple Choice

Score on science exam and number of words written on the essay question.  $$r=.28$$  

• strong positive

• strong negative

• weak positive

• weak negative

Multiple Choice

Car weight and distance traveled using a full tank of gas.  $$r=-.86$$  

• strong positive

• strong negative

• weak positive

• weak negative

Multiple Choice

Number of steps taken per day and number of kilometers walked per day. $$r=.92$$  

• strong positive

• strong negative

• weak positive

• weak negative

Correlation Coefficient

Correlation Coefficient (r value)

from the calculator

Find r of the following data set:

(1,10)

(5,20)

(3,15)

(2,14)

(1,8)

(0,3)

(4,15)

(1,8)

(2,9)