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how do I use Graph Builder to curve fit/trendline giving weightage to few points?

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how do I use Graph Builder to curve fit/trendline giving weightage to few points?

Dear Friends,

 

I need your help in following data set.

 
Suppose I have temperature, defects and total parts produced at that temperature,
temperaturedefect PercentNumber of parts produced
6401010
6451550
6503200
6553.21000
66032000
6652100
6701010

I want a graph of temp v/s defect percentage and giving weightage to total parts produced.

If I don't consider weights(total parts produced) the trend is misleading. For instance at 640 deg, total parts produced is 10, but just one defect makes defect percentage 10%. Which affects the trendline. Is there any way to give weightage based on number of parts produced at that temperature.

In other words 650, 655. 660 actually represent the trend as number of parts produced are high and give clear picture, increase in temperature reduces defects. Also I cannot discard first two and last two points.

 

Thanks

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