CRM Unit 2A Review

Which has the largest interquartile range? Why?

• Emilia, because it's 8,000

• Quincy, because it's 7,000

• Quincy, because it's 6,000

• They're the same at 4,000

Which statement is NOT true based on the given data?

• The median of Darnel's carries is less than the upper quartile of Jaden's carries.

• The upper quartile of Neil's carries is equal to the median of Jaden's carries.

• The interquartile range of Neil's carries is equal to the interquartile range of Darnel's carries

• The lower quartile of Neil's carries is less than the lower quartile of Jaden's carries.

Increase or decrease? Be specific

• Increase by 1

• Decrease by 1

• Cannot be determined

• No change in the median

Which statements are true?

• It has negative correlation

• Slope is -1/3

• Crosses y-axis at (0,48)

• r is close to -1

The equation for the line of best fit is y = (1/12) x + (1/3). According to the equation, which statement is true?

• A typical customer picks about 1/3 of a pound of blueberries per minute.

• A typical customer picks about 1/12 of a pound of blueberries a minute.

• 1/3 pounds of blueberries will be picked after 1 minute.

• 1/12 of a pound of blueberries will be picked after 1/3 of a minute.

The equation for the line of best fit is y = -2x + 25. According to the equation, which of these statements is true?

• Ezra will probably fall about 1 time on the 11th day.

• Ezra will fall 12 times on the 6th day.

• Ezra will probably fall about 7 times on the 11th day.

• Cannot be determined.

Find the correlation coefficient of the data described here.

• r = -0.63

• r = 0.80

• r = -0.25

• r = 0.20

​ Match each correlation coefficient to the appropriate scatter plot.

• r = -0.5

• 
• r = 0.2

• 
• r = 0

• 
• r = -1

• 

Each of these relationships reflects a correlation. Which relationship most likely reflects correlation but NOT causation?

• Owning more dogs is associated with visiting the vet more often.

• Owning more dogs is associated with owning more cats.

• Owning more dogs is associated with buy more dog food.

• Cannot be determined.

Each of these relationships reflects a correlation. Which relationship most likely reflects both correlation AND causation?

• When coffee shops grind more coffee beans, they make more pastries.

• When coffee shops serve more coffee, they use more cups.

• When coffee shops make more lattes, they make more cappuccinos.

• Cannot be determined.