that provides a calibration curve relating measured differential pressure across a 90 degree elbow to mass flow rate. Th

[answerhappygod]

that provides a calibration curve relating measured differential
pressure across a 90 degree elbow to mass flow rate. The purpose of
this is to have a curve that, given a measured differential
pressure the user/operator can find the mass flow rate through the
elbow.
Your report should contain a graph of the measured data with
error bars for a 95% confidence interval. You should also have a
linear curve fit to the data with the associated equation and R
squared value. Include the method that you used to find the
coefficients of your equation. You may also use a software package
to find a non-linear fit. You should then compare the relative
accuracy of the linear and non-linear fits.
how do I do these in excel? and give a proper explanation