MATLAB: An Introduction with Applications
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ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Transcribed Image Text:We want to investigate the correlation between
concentration of Se (Selenium) in the teeth and
its concentration in the liver in 20 Beluga
Whales.
240
220
We suspect that the higher the
the higher the
concentration in the liver,
concentration in the teeth. A plot of the data is
given at right, and the following summary
statistics are given for these data:
200
180
160
X = 20.68 Sy= 13.45
y =
= 156.60
Sy
= 36.06
140
0.54 Se
= 31.25
r =
120
Before actually computing its value (that is, by just
looking at the scatterplot), how do we know that
r > 0 (rather than r = 0 or r<0)?
10
20
30
40
Liver Se (ug/g dry wt)
Calculate the regression line Y = bo + bịX (that is, find the slope b, and y-intercept bo) for
Tooth Se (variable Y in the line) as a function of Liver Se (variable X in the line).
Interpret the value of the slope b, that you just found. That is, what does b, tell you about
how Tooth Se and Liver Se are related? (And don't just write that it's the slope.)
Tooth Se (ng/g dry wt)
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