When plotting this I will get the following output.
I wanted to obtain a polynomial equation that will fit this line. Therefore I created a 5th order polynomial as shown below.
p5 = polyfit(MContent, BitValue, 5);
format long g
pp5 = polyval(p5, MContent);
plot(MContent, pp5, '-p')
Which gives this output.
This line is a satisfactory fit and I intended to use the equation obtained from this to get bit values when I add the moisture content into the 'x' value. To get this polynomial equation I used the following command.
Just because the coefficient is small doesn't mean it isn't important...it is, after all the coefficient of x^5 and 75^5 = 2.3730e+09 so a factor of 10E-5 on the coefficent is still a 10E4 contribution so you can't just ignore it.