Topic 4 Practice Test

The scatter plot shows the rainfall, in millimeters, recorded each day during a 20-day period.

On which day was the rainfall recorded an outlier? 

• 1

• 7

• 17

• 20

Data sets A and B are graphed on the coordinate grid.

Which statement about the lines of best fit for the two data sets is most likely true?

• The lines of best fit for data sets A and B are the same line.
  

• The y-intercepts and the slopes of the lines of best fit for data sets A and B both differ by 4.

• The y-intercepts of the lines of best fit for data sets A and B differ by 4, but the slopes are the same.

 The height (y) of the tallest building in Pittsburgh in year x is shown in the scatter plot.

  

Based on the scatter plot, which statement is true? 

• The data show no correlation.
  

• The data show a positive correlation.
  

• The data show a negative correlation.
  
  

  
  

• There are not enough data points to determine correlation.

The number of students, y, still participating in the final round of a school spelling bee compared to the number of spelling words attempted, x, can be represented by a scatter plot with a negative, linear association. Which equation for a line of best fit could be used to represent the number of students still participating in the final round of the school spelling bee given a number of spelling words attempted? 

• y = 0.5x + 10
  

•  y = -0.5x + 10
  

The manager of a movie theater keeps track of the number of people attending the same movie each day for the first week the movie is being shown. The data has a negative, linear association with no outliers. Which scatter plot could represent the movie data? 

• 
• 
• 
• 

 The scatter plot shows how much bags of grass seed cost based on their weight in pounds at different stores.

              

Which statement best describes the correlation between the weight and the cost of a bag of grass seed? 

• There is a positive linear correlation.
  

•  There is a negative linear correlation.
  

• There is a positive non-linear correlation.
  

•  There is a negative non-linear correlation.
  

A scatter plot is graphed on the coordinate grid.

Which equation best describes a line of best fit for the data? 

•   y = 0.8x + 8
  

• y = 8x + 0.8
  

• y = -0.8x + 8

• y = -8x + 0.8

The scatter plot shows the temperatures (y), in degrees Fahrenheit (°F), that were recorded at different altitudes (x), in thousands of feet.

 

Which equation could represent the line of best fit for the temperatures, in degrees Fahrenheit, based on the altitudes, in thousands of feet? 

The number of tickets sold for events at a theater last year varied with the cost per ticket, as shown in the scatter plot.

Based on the equation of the line of best fit for the scatter plot, which statement about the relationship between cost per ticket and number of tickets sold is true? 

• The slope of the line of best fit is approximately -26.5, which means that for every $2 increase in cost per ticket, the number of tickets sold decreased by 26.5.
  

• The slope of the line of best fit is approximately -26.5 , which means that for every $1 increase in cost per ticket, the number of tickets sold decreased by 26.5.
  

• The slope of the line of best fit is approximately 26.5, which means that for every $2 increase in cost per ticket, the number of tickets sold increased by 26.5.
  

• The slope of the line of best fit is approximately 26.5, which means that for every $1 increase in cost per ticket, the number of tickets sold increased by 26.5.  

  
  

  The scatter plot shows the ages of some children and the amount of time each spent playing outside last week.

Which equation could represent the line of best fit for the number of hours a child spends playing outside based on the age of the child?

• y = 0.75x + 4.5
  

•  y = 0.8x + 6.4
  

• y = x + 4
  

• y = 1.25x