Correlation Coefficient
Modeling Functions
Trivia
Lines of Fit
Predicting Values
100
Describe this correlation coefficient as weak, moderate, or strong.
r= -0.99
Strong
100
Write the equation, identify the function, and explain.
The value of a motorcycle changes over time. The motorcycle starts at $18,000 and loses $1,500 in value each year.
y=18000-1500x
Linear because it has a constant rate of change.
100
What is the main profession of the Mario character Luigi?
Plumber
100
What form must lines of fit must be written in?
Slope-intercept form or y=mx +b
100
The relationship between the age of a tadpole in days (x) compared to its tail length in mm (y) is represented by y=-1.3x+17.5
Predict the length of the tail after 5 days.
11 mm
200
Describe this correlation coefficient as weak, moderate, or strong.
r= 0.20
Weak
200
Identify the function, and explain.
The value of a motorcycle changes over time. The motorcycle follows the equation
y=-400x^2+18000
Quadratic. The variable is squared.
200
In what year was the first iPhone released?
2007
200
In order to calculate slope, you use....
200
The relationship between the age of a tadpole in days (x) compared to its tail length in mm (y) is represented by y=-1.3x+17.5
Predict the length of the tail after 12 days.
1.9 mm
300
Describe this correlation coefficient as weak, moderate, or strong.
r= 0.099
Weak
300
Write the equation, identify the function, and explain.
A toy company is tracking how the number of collectible figures sold changes over time. The company is selling 200 figures, and the number is tripling each month.
y=200(3)^x
Exponential because it has a growth factor of 3.
300
What is the only bird that can fly backwards?
Hummingbird
300
Two points on the line of best fit are (2, 15) and (1, 5). Find the slope for the line of best fit using these points.
Slope: 10
300
The relationship between the age of a tadpole in days (x) compared to its tail length in mm (y) is represented by y=-1.3x+17.5
Predict how long it takes for the tail to be 4 mm
10 days
400
Describe this correlation coefficient as weak, moderate, or strong.
r= -0.33
Moderate
400
Write the equation, identify the function, and explain.
The value of a motorcycle changes over time. The motorcycle starts at $18,000 and loses 12% of its value each year.
y=18000(1-0.12)^x
y=18000(0.88)^x
Exponential. Decreases by a percentage.
400
Who quoted this line
"The best time to wear a striped sweater is all the time"
SpongeBob SquarePants
400
Two points on the line of best fit are (4, 85) and (2, 70). Find the slope for the line of best fit using these points.
7.5
400
The relationship between the age of a tadpole in days (x) compared to its tail length in mm (y) is represented by y=-1.3x+17.5
Predict how long until the tail is 1.5 mm.
12 Days
500
Describe this correlation coefficient as weak, moderate, or strong.
r= -0.74
Moderate
500
Write the equation, identify the function, and explain.
A boat rental company is studying how the value of a speedboat changes over time. The speedboat starts at $32,000 and loses 8% of its value each year.
y=32000(1-0.08)^x
y=32000(0.92)^x
Exponential: Decreases by a percentage.
500
List the U.S. States that start with the letter "M"
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
500
Find the equation of the line of best fit 
y=-2x+20
500
The relationship between the age of a tadpole in days (x) compared to its tail length in mm (y) is represented by y=-1.3x+17.5
Predict how long it will take for the tadpole to have no tail.
13 days