Unit 3

Which value would best fit in the missing cell to suggest there is no evidence of an association between the variables?

• 5

• 19

• 27

• 65

Fill in the empty portion of the table with a value based on the given information if there were 500 people surveyed.

• 223

• 170

• 172

• 187

Determine if there is an association between the variables.

• Yes, there is an association between passing the quiz and whether they studied.

• No, there is an association between passing the quiz and whether they studied.

Which of these graphs represents the residuals for a scatter plot that is fit well by a linear model?

• 
• 
• 
• 

Which of the following is the best estimate of the correlation coefficient for the line of best fit shown in the scatter plot?

• r = 0.51

• r = -0.96

• r = -0.76

• r = 0.84

Which of the following is the best estimate of the correlation coefficient for the line of best fit shown in the scatter plot?

• r = 1

• r = 0.89

• r = -0.75

• r = 0.21

The data in the graph suggest a linear association. Which functions best represents the equation of the line of best fit?

• y = 73x + 146.53

• y = -21x - 917.50

• y = 65x + 125

• y = -70x + 110

What proportion of people who took the survey prefer to spend their spring break skiing?

• 91/151

• 24/60

• 60/151

• 36/60

Data about the outside temperature and gas used for heating a building are given in the table. The line of best fit equation is y = -180x + 16,938. What is the slope of the line of best fit? What does it mean in this situation?

• Slope = -180. When the outside temperature increases 1 degree Fahrenheit, gas usage is decreased by about 180 therms.

• Slope = -180. When the gas usage increases by 1 therm, the temperature decreases by 180 degrees Fahrenheit.

• Slope = 16,938. When the outside temperature increases 1 degree Fahrenheit, gas usage is decreased by about 16,938 therms.

• Slope = 16, 938. When the gas usage increases by 1 therm, the temperature decreases by 16,938 degrees Fahrenheit.

The line of best fit for a data set is y = 1.1x + 3.4 . Find the residual for the coordinate ( 5 , 8.8 )

• -8.08

• -0.1

• 3.3

• 0.1