Given the following data, how many degrees of freedom should be
used for statistical evaluation of this calibration data?
Concentration of Cu /ppm
Absorbance at 580 nm
0.0000
0.100
0.1000
5.800
0.2000
12.200
0.4000
22.300
0.8000
43.300
1.0000
61.300
1.2000
82.100
unknown
10.300