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excel trendline formula is inaccurate

While trying to create a graph with trendline to predict what a thermistor reading for a Prius’s radiator/engine temperature would be at certain temperatures I started battling MSFT’s Excel.

I created a chart with the known data collected about the voltage at the thermistor for  a list of temperatures.  I wanted a trendline to show . . . → Read More: excel trendline formula is inaccurate