Scatterplots and Trend

This scatterplot could show the relationship between which two variables?

• speed of an airplane (x) vs. distance traveled (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 shows a line of best fit for the scatterplot?

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For which scatterplot would the line of best fit be represented by the equation:

y=1/2 x +2?

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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 scatterplot of the data, she determined the equation of a line of best fit. The equation is shown below.

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

Which scatterplot shows a weak negative correlation?

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The scatterplot shows the relationship between the number of bags of popcorn that are sold and the price per bag.

Which of these graphs shows the line of best fit?

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Which of the following lines represents the line of best fit for the scatter plot?

• A

• B

• C

• D

• gain 5 hour of sleep for 7 cups of coffee

• lose 5 hours of sleep for 7 cups of coffee

• lose 7 cups of coffee for 5 hours of sleep

• lose 5 cups of coffee for 7 hours of sleep

• gain 7 cups of coffee for every 5 hours of sleep

Duane made a trend line based off of his scatter plot and found that the slope was 9. What does the slope mean?

• There are 9 people at the beach

• The number of people at the beach increases by 9 for every temperature increase of 1

• The temperature is 9

• The temperature increases by 9 for every 1 person at the beach

What is the correlation between length of running start and distance of jump?

• positive:  the further you run the further you jump

• negative: the less you run the less distance of your jump

• positive: the further your running start the less your distance