Chapter 6 Algebra

What does it mean when two variables have a positive association?

• When the variables move in opposites directions, one increases and the other decreases.

• When the first variables has no effect on the second variable

• When the variables move in the same direction. They both increase.

Label the type of association:

• Positive

• None

• Negative

Which would NOT likely be the variables represented on the scatter plot.

• The number of miles driven and the gallons of gas used.

• The number of students in a school and the number of unused lockers

• the number items ordered at a restaurant and the cost of the bill

• the number of customers in a store and the length of the wait at the register

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

What is the line of best fit?

• f(x)= 5x+1.82

• cannot be determined

• f(x)= 1.82x + 5.02

• f(x)= 1.1x + 4.2

Which of the following lines represents the line of best fit for the scatter plot?

• A

• B

• C

• D

As x increases, y increases

• correlation coefficient

• causation

• positive correlation

• negative correlation

What does the slope mean in the context of the problem?

• The cost will increase by $1.40 per topping

• The cost will decrease by $1.40 per topping

• The cost will increase by $1.90 per topping

• The cost will decrease by $1.90 per topping 

What is the meaning of the y-intercept?

• The hamburger will cost $1.90 without any toppings.

• The hamburger will cost $1.40 without any toppings. 

• The cost of the hamburger is $1.90 with one topping

• The cost of the hamburger doesn't change no matter how many toppings there are.

If Dexter pays $8.90 for his hamburger, how many toppings did he get?

• 3

• 4

• 5

• 6