Astronomy 23/223 In-Class Exercise:

How Old is our Solar System?

In this exercise, we will calculate the age of the igneous rocks that make up the oldest parts of the Moon, which are the anorthosites in the highland areas. The dates we will use came from a paper by Papanastassiou and Wasserburg (1972).
 

Determine the age of these inclusions by filling in the following worksheet.

Linear Regression the Old-Fashioned Way
(Fill in the Blanks...)

X Data
87Rb/86Sr
Xi



Xi2
Y Data
87Sr/86Sr
Yi



Yi 2


XiYi
Sample 1 0.03298 0.70127
Sample 2 0.04614 0.70209
Sample 3 0.02414 0.70060
Sample 4 0.17130 0.70954
Sample 5 0.15250 0.70840
Sample 6 0.13800 0.70748
Sample 7 0.13650 0.70758
Sample 8 0.12680 0.70733
Sample 9 0.09050 0.70497
Sample 10 0.07280 0.70373
SUM

= ________ = _________

= average X = ________ = average Y = ________

= _________ = ________

= ________


Now, solve either form of the following two equations, and you'll know the equations of your line!

 

 


Equation for regression line is: Y = slope X + intercept


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This page was created by Darby Dyar and is maintained by Darby Dyar and Rebekah Robson-May.
Last updated on 12 September, 2003 .