Math 1 Unit 4 Review

What is the interquartile range (IQR)?

• 4

• 64

• 60

How many students had more than 6 candy bars?

• 5

• 2

• 3

How many students scored between a 86 and a 90?

• 1

• 3

• 6

Which class has the higher test score median?

• Class #1

• Class # 2

• The medians are equal

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

• A

• B

• C

Which of the following correlation coefficient values of r would correspond to a line that is a good fit for the data?

• r = -.999

• r = -.001

• r = 0

As the age of the car increases, its value decreases. Which scatterplot represents this relationship?

• A

• B

• C

Jim just hired a crew of painters to pain several rooms of his new home. The painters provided Jim with the costs of their services (see the table). The equation for the line of best fit for this data is y = 30x +60. What is the meaning of the y-intercept of this line?

• The total cost of their services is $60.

• The total cost increases by $30 per hour.

• The base fee charge to come out and paint is $60.

Jim just hired a crew of painters to pain several rooms of his new home. The painters provided Jim with the costs of their services (see the table). The equation for the line of best fit for this data is y = 30x +60. What is the meaning of the slope of the line of best fit?

• The total cost increases by $30 per hour.

• The total cost decreases by $30 per hour.

• The total cost increases by $60 per hour.

• The total cost decreases by $60 per hour.

If the painters charged Jim a total of $300, how many hours did they work?

• 7 hours

• 8 hours

• 9060 hours