source: nasa unit 5, investigation 1 activity 1.1, p. 1 of 12
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Source: NASA
Source: NASA
Unit 5, Investigation 1
Activity 1.1, p. 1 of 12
Sea Level Rise
The table shows the annually averaged change in the sea level since 1888.
Many believe that this increase is due to global warming.
Let x be the number of years since 1900.
Year(Since 1900)
x
Sea Level Change (cm)
y
0 1.5
10 1
20 3
30 4.5
40 7
50 9
60 11.5
70 12.5
80 13.5
90 14
100 17.5
Hubbard Glacier, Alaska, June 2005Source: The original data for this table is from the Permanent Service for Mean Sea Level (PSMSL).
Unit 5, Investigation 1Activity 1.1, p. 2 of 12
Sea Level RiseYear
(Since 1900)x
Sea Level Change (cm)
y
0 1.5
10 1
20 3
30 4.5
40 7
50 9
60 11.5
70 12.5
80 13.5
90 14
100 17.5
Hubbard Glacier, Alaska, June 2005
If this trend continues, predict how much the sea level will have risen by 2010 and 2020.
Unit 5, Investigation 1
Activity 1.1, p. 3 of 12
Year(Since 1900)
x
Sea Level Change (cm)
y
0 1.5
10 1
20 3
30 4.5
40 7
50 9
60 11.5
70 12.5
80 13.5
90 14
100 17.5
One approach to making our prediction is to graph the data in the table to determine if there is a trend.
Unit 5, Investigation 1Activity 1.1, p. 4 of 12
How can we effectively use this scatter plot to make our predictions?
Unit 5, Investigation 1Activity 1.1, p. 5 of 12
How do we use the trend line to help us make our predictions?
Unit 5, Investigation 1Activity 1.1, p. 6 of 12
Unit 5, Investigation 1Activity 1.1, p. 7 of 12
Find the equation of the trend line.
Unit 5, Investigation 1Activity 1.1, p. 8 of 12
Unit 5, Investigation 1Activity 1.1, p. 9 of 12
Use the equation to predict how much the sea level will have risen by the year 2010 and the year 2020.
1 1
6 3y x
Unit 5, Investigation 1Activity 1.1, p. 10 of 12
Unit 5, Investigation 1Activity 1.1, p. 11 of 12
Use the equation to predict by which year the sea level will have risen 23 centimeters since 1888.
1 1
6 3y x
If this trend continues, by 2036, the sea level will have risen 23 centimeters since 1888.
Unit 5, Investigation 1Activity 1.1, p. 12 of 12