Lesson 2: Scatterplots Review. Have you ever played Battleship? Battleship uses coordinates… AKA ordered pairs! Try playing a quick game with a partner.

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Presentation transcript:

Lesson 2: Scatterplots Review

Have you ever played Battleship? Battleship uses coordinates… AKA ordered pairs! Try playing a quick game with a partner Lesson 2: Scatterplots

Draw two grids on graph paper. Mark off a scale from 0 to 10 on both the horizontal and vertical axes. Lesson 2: Scatterplots

On one grid draw four ships. Draw them using only horizontal and vertical lines. Each ship consists of several points joined by a straight line. Aircraft Carrier: 5 points on the grid Destroyer: 4 points on the grid Submarine: 3 points on the grid Battleship: 2 points on the grid Lesson 2: Scatterplots

Play another game of Battleship, but this time using negative numbers. Draw two grids on graph paper. Mark off a scale from -5 to 5 on both the horizontal and vertical axes. Lesson 2: Scatterplots

On one grid draw four ships. Draw them using only horizontal and vertical lines. Each ship consists of several points joined by a straight line. Aircraft Carrier: 5 points on the grid Destroyer: 4 points on the grid Submarine: 3 points on the grid Battleship: 2 points on the grid Lesson 2: Scatterplots

Height (cm)

Does a relationship exist? Can you describe it? Lesson 2: Scatterplots

Raise your hand if you drank a hot beverage (hot chocolate, coffee, tea) within the last month. If I asked this same questions in August, what do you think the result would be? Why? Lesson 2: Scatterplots

When the data we have is related in some way, the variable that depends on the other variable is called the Dependent Variable. The variable that doesn’t depend on the other is called the Independent Variable. When graphing, the independent variable always gets placed along the x-axis, and the dependent on the y-axis. In a table of values the independent variable is placed in the left hand column and the dependent variable in the right hand column. Lesson 2: Scatterplots

xY Independent Variable Dependent Variable Lesson 2: Scatterplots

Dependent Independent Lesson 2: Scatterplots

What about Julie’s experiment? Which variable was independent, and which was dependent? Dependent Variable: Independent Variable: Lesson 2: Scatterplots

Examples Which of these variables are related, and if they are, which is the dependent variable? 1.Cost of a dozen donuts and the year. 2.The number of pet cats adopted from the Humane Society last year and the number of computers purchased last year. 3.Your shoe size and your age. Lesson 2: Scatterplots

How do we know if a relationship exists between two pieces of data? A relationship exists if a change in one variable will cause a change in the other. Look for relationships in the following scatterplots: Lesson 2: Scatterplots

The average cost of a DVD How far Mrs. Gonzalez-Day Runs Cost of DVDs VS. Running Distance Lesson 2: Scatterplots

Practice  Pg. 148 # 1- 5