1st Pd- Scatter Plots and Lines of Fit

​Scatter Plots and Lines of Fit

By Sheena Johnson

Warm Up

Multiple Choice

What is the slope of the equation?
y=-2x-1

• 2
• -2
• -1
• 1

Multiple Choice

y = 1/2x - 1

• slope: 1/2   y-intercept:  -1 
• slope: 2/1   y-intercept:  -1
• slope: 3   y-intercept:  -3 
• slope: 2  y-intercept:  5 

Multiple Choice

Y-intercept is where the line ______________.

• begins
• crosses the x-axis 
• crosses the y-axis 
• ends

Multiple Choice

When you graph a line using slope-intercept form, you plot the  ___________ first and then the ___________.

• origin; slope 
• slope; y-intercept
• y-intercept; x-intercept
• y-intercept; slope

Multiple Choice

Which of these represents slope-intercept form?

• y - y₁ = m(x-x₁)
• Ax + By = C
• y = mx + b

Multiple Choice

Which is the graph of y= -x + 2?

• A
• B
• C
• D

Multiple Choice

Solve for y:
y + 2 = 3x

• y = 2x + 3
• y= 3x +2
• y= 3x -2
• y= 6x

Independent Practice

​Stop here at prepare to take notes!

Don't forget to turn in Scratch work!

Multiple Choice

What is the correlation between length of running start and distance of jump?

• positive:  the further you run the further you jump
• negative: the less you run the less distance of your jump
• positive: the further your running start the less your distance

Multiple Choice

Which scatter plot shows a linear relationship between x and y?

• Graph A
• Graph B
• Graph C
• Graph D

Multiple Choice

What type of association does this graph have?

• positive 
• negative
• none
• all of the above

Multiple Choice

What type of correlation (association)?
The outside temperature and the amount of layers you wear. 

• Positive correlation
• Negative correlation
• No correlation
• All of the above

Multiple Choice

The number of siblings you have and your weight. 

• Positive correlation
• Negative correlation
• No correlation
• All of the above

Multiple Choice

As x increases, y increases

• correlation coefficient
• causation
• positive correlation
• negative correlation

Multiple Choice

What is the correlation?

• Negative correlation
• No correlation
• Positive correlation
• All of the above

Multiple Choice

In a scatterplot, an outlier...

• ...is something we didn't learn 8th grade
• ...is a puppet with a long nose named Pinocchio
• ...is a point that is far outside the main cluster of points/ordered pairs
• ...is a really naughty point who doesn't tell the truth when outside

Multiple Choice

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?

• The more books students read, the lower their English grade.
• The more books students read, the higher their English grade.
• The fewer books students read, the higher their English grade. 
• No relationship exists between the number of books students read and their English grades. 

Multiple Choice

Describe the correlation in the graph shown.

• Strong Negative
• Strong Positive
• Weak Negative
• Weak Positive

Multiple Choice

What type of association does this scatter plot represent?

• positive linear association
• negative association
• no association
• nonlinear association

Multiple Choice

What represents the x axis?

• ABC Company
• Hours Worked
• Amount Earned in Dollars
• Hours in Car

Multiple Choice

A trucking company keeps track of the number of miles each of its drivers logs each week.  Describe the correlation between the number of miles a driver logs and the drivers age.

• There is a positive correlation.
• There is a negative correlation.
• There is no correlation.
• There is a parallel correlation

Multiple Choice

Which sentence describes the relationship shown on this scatter plot?

• As the temperature decreases, the visitors increase.

• As the temperature increases, the number of visitors increases.

• As the visitors increase, the temperature decreases.

• No correlation

Multiple Choice

Based on the scatterplot, which of the following conclusions about the relationship between her height and weight is true?

• There is a negative relationship between height and weight

• There is a positive relationship between height and weight

• There is a constant relationship between height and weight

• There is no relationship between height and weight

Multiple Choice

Scatter plots show trends in data.

• True
• False

Multiple Choice

What represents the y axis?

• ABC Company
• Hours Worked
• Amount Earned in Dollars
• Hours in Car

Multiple Choice

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?

• The more books students read, the lower their English grade.
• The more books students read, the higher their English grade.
• The fewer books students read, the higher their English grade. 
• No relationship exists between the number of books students read and their English grades. 

Multiple Choice

What is a scatter plot?

• A graph that shows the relationship of two data sets.
• A graph drawn using rectangular bars to show how large each value is.
• A graph that shows information that is connected in some way.
• A graph that shows data changing over time.

Multiple Choice

What represents the x axis?

• ABC Company
• Hours Worked
• Amount Earned in Dollars
• Hours in Car

​Exit Ticket

Turn in scratch work once you have finished the Exit Ticket.

Multiple Choice

What is the type of correlation?

• Negative 
• no association
• positive 

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 140 pages. 

• 12 chapters
• 19 chapters
• 14 chapters
• 21 chapters

Multiple Choice

About how many male math teachers were there in 2006?

• 15
• 30
• 35
• 45

Multiple Choice

Which scatter plot shows a linear relationship between x and y?

• Graph A
• Graph B
• Graph C
• Graph D

Multiple Choice

Mrs. Collins made a scatterplot to show the relationship between the number of absences and a student’s final exam score. Based on this scatterplot, a student with 6 absences should get approximately what score on the final exam?

• 85

• 92

• 70

• 76

Multiple Choice

What is a line of best fit used for?

• To make predictions
• To make the graph look pretty
• To connect the points
• To make it look like you know what you are doing

Multiple Choice

Which sentence describes the relationship shown on this scatter plot?

• As the temperature decreases, the visitors increase.

• As the temperature increases, the number of visitors increases.

• As the visitors increase, the temperature decreases.

• No correlation