Scatterplots and Line Curve of Best Fit

A researcher gathered data to predict the number of new types of plants (y) that will be in a state park after x years.  After making a scatter plot of the data, she determined the equation of a line of best fit to be
y = 0.25x + 8
Based on the equation, what is the number of new types of plants that will be in the park after 24 years?

• 8

• 14

• 32

• 64

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

What type of relationship does this graph have?

• Positive

• Negative

• No Relationship

• Constant 

Which statement best describes the relationship shown in this scatter plot?

• Students with a bigger shoe size earn a higher math score

• Students with a smaller show size earn a higher math score

• A student's shoe size has no effect on their math score

• A student with a shoe size of 8 will always earn a score of 80%

What is a line of best fit used for?

• To make predictions

• To make the graph look pretty

• To connect the points

To graphically represent a correlation between two variables construct a ___.

• box & whisker diagram

• histogram

• normal curve

• scatterplot

Describe the correlation

• Strong Negative

• Strong Positive

• Weak Negative

• Weak Positive

Which statement best represents this relationship?

• There is no relationship between the number of miles driven and the amount of gas remaining in the tank

• As the number of miles driven increases, the amount of gas remaining in the tank increases.

• As the number of miles driven increases, the amount of gas remaining in the tank decreases.

• A relationship cannot be determined from this scatter plot

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.