He Said, She Said (Unit 9)

Four students observed the association shown on the scatter plot shown below.

• Archie says the scatter plot shows positive linear association.

• Autumn says the scatter plot shows positive non-linear association.

• Anthony says the scatter plot shows negative linear association.

• Alice says the scatter plot shows negative non-linear association.

Tags

CCSS.8.F.A.3

CCSS.8.SP.A.1

CCSS.8.SP.A.2

A study of several different supermarkets showed that as the number of self-checkout lanes increases the number of cashiers working decreases.

• Bernard says the association between the variables is negative.

• Beatrice says the association between the variables is positive.

• Baxter says there is no association between the variables.

• Betsy says there is not enough information to decide what the association between the variables is.

Tags

CCSS.8.F.B.5

CCSS.8.SP.A.1

CCSS.8.SP.A.2

The table shows the weight of a package and the cost of shipping the package.

• Charlie says the association is positive because as the weight increases the price increases.

• Cher says the association is negative because as the weight decreases the cost decreases.

• Corbin says the association is positive because as the weight increases the price decreases.

• Colleen says the association is negative because as the weight increases the cost increases.

Tags

CCSS.8.SP.A.1

CCSS.8.SP.A.2

A trend line was created to show the overall pattern of the scatter plot below.

• Douglas predicts that the value of y will be 50 when x=4.

• Debbie predicts that the value of y will be 55 when x=4.

• Darrell predicts that the value of y will be 40 when x=4.

• Darlene predicts that the value of y will be 60 when x=4.

Tags

CCSS.8.F.A.3

CCSS.8.F.B.4

CCSS.8.F.B.5

CCSS.8.SP.A.1

CCSS.8.SP.A.2

CCSS.8.SP.A.3

Several people’s ages and the number of speeding tickets they have received is shown on the scatter plot.

• Edmond says based on the trend line, he would predict a 75 year old to have received 7 tickets.

• Ellie says based on the trend line, she would predict a 75 year old to have received 9 tickets.

• Earl says based on the trend line, he would predict a 75 year old to have received 5 tickets.

• Elaine says based on the trend line, she would predict a 75 year old to have received 3 tickets.

Tags

CCSS.8.F.B.5

CCSS.8.SP.A.1

CCSS.8.SP.A.2

The length, in minutes, of five different movies showing at the theater are listed below:

120, 153, 117, 125, 135

• Griffin says the mean absolute deviation of the numbers is 130.

• Gretchen says the mean absolute deviation of the numbers is 11.2.

• Grant says the mean absolute deviation of the numbers is 56.

• Grace says the mean absolute deviation of the numbers is 2.3.

Tags

CCSS.6.SP.A.3

CCSS.6.SP.B.5