Scatter Plots

This scatterplot could show the relationship between which two variables?

• speed of an airplane (x) vs. distance traveled in one hour (y)
• outside air temperature (x) vs. air-conditioning costs (y)
• age of an adult (x) vs. height of an adult (y)
• distance traveled (x) vs. gas remaining in the tank (y)

Which graph best shows a positive correlation between the number of hours studied and the test scores?

• Graph A
• Graph B
• Graph C
• Graph D

For which scatter plot would the line of best fit be represented by the equation y = ½x + 2?

• Graph A
• Graph B
• Graph C
• Graph D

Which data will most likely show a negative correlation when graphed on a scatter plot?

• The outside temperature and the number of people wearing gloves.
• The distance a student lives from school and the amount of time it takes to get to school.
• The number of visitors at an amusement part and the length of the lines for the rides.
• A student's height and grade point average.

This scatter plot shows the average traffic volume and average vehicle speed on a certain freeway for 50 days in 1999.  Which statement best describes this relationship.

• As traffic volume increases, vehicle speed increases.
• As traffic volume increases, vehicle speed decreases.
• As traffic volume increases, vehicle speed increases at first, then decreases.
• As traffic volume increases, vehicle speed decreases at first, then increases.

Which best shows the relationship in this scatterplot?

• positive

• negative

• none

• all of the above

Ms. Ochoa recorded the age and shoe size of each student in her physical education class.  This graph shows her data.  Which of the following statements about the graph is true?

• The graph shows a positive trend.
• The graph shows a negative trend.
• The graph shows a constant trend.
• The graph shows no trend.

A group of friends recorded the time it took to ride their bikes around the park.  This scatter plot shows their results with the line of best fit.  Which is closest to the number of minutes it would take to complete 9 laps?

• 4
• 5
• 6
• 7

Which equation could describe the line of best fit for this graph?

• y = 5x + 236
• y = -5x + 236
• y = 1/5x + 236
• y = -1/5x + 236

Based on the line of best fit for the scatter plot, which of the following amounts is closest to the cost of a 120-minute phone call?

• $10

• $12

• $15

• $20