Scatter Plots

The scatter plot below shows the average traffic volume and average vehicle speed on a certain freeway for 50 days in 1999.

Which statement best describes the relationship between average traffic volume and average vehicle speed shown on the scatter plot?

• 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

Ms. Ochoa recorded the age and shoe size of each student in her PE class. The 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

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

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The police department tracked the number of ticket writers and number of tickets issued for the past 8 weeks. The scatter plot shows the results. Base on the scatter plot, which statement is true?

• More ticket writers results in fewer tickets issued

• There were 50 tickets issued every week

• When there are 10 ticket writers, there will be 800 tickets issued

• More ticket writers results in more tickets issued

Mr. Thomas wanted to know if the amount of class time that he gave students to study affected their test scores. The scatter plot shows the results.

What kind of relationship between class study time and test scores is shown on the scatter plot?

• no correlation

• positive correlation

• negative correlation

• positive then negative correlation

A fifth grade class conducted a 5-minute experiment that involved heating time and water temperature. The results of the experiment are represented in the graph.

Which prediction can be made based on the info gathered?

• The water temp remains the same as the heating time continues

• The water temp decreases as the heating time continues

• A pattern cannot be determined between these measurements

• The water temp increases as the heating time continues

The following scatter plot shows the weights and lengths of some dinosaurs.

Which statement accurately describes the info in the scatter plot?

• The information shows a positive correlation. The weight of a dinosaur tends to increase according to its length.

• The information shows a negative correlation. The weight of a dinosaur tends to decrease according to its length.

• The information shows no correlation. The weight and length vary according to the type of dinosaur.

• The information shows no correlation. The relationship between the weight and length of a dinosaur is uncertain.

The table shows the number of students on a basketball team and the number of free throws each student made during practice.

Based on this info, which best describes the relationship between the number of students and the number of free throws each student made?

• Positive linear

• No relationship

• Negative linear

• Quadratic

The scatter plot shows the number of absences in a week of classes of different sizes. Trevor concluded that there is a positive correlation between class size and the number of absences.

Which statement best describes why Trevor's conclusion was incorrect?

• The largest class does not have the most absences.

• The smallest class does not have the least number of absences.

• The data show no relationship between class size and number of absences.

• The data show a negative relationship between class size and number of absences.

Which date 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 park and the length of the lines for the rides

• A student's height and graph point average