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Hello, I am developing...

Hello, I am developing a sales projection algorithm and we need to determine "how accurate" or "how much confidence" we have in this. So we applied the algorithm to determine what we project Q1 sales would have been, then we compare against what Q1 sales really were and let's say the results are below. How do we calculate a number on "how accurate" or "how confident are we" in this algorithm? Customer Projected Q1 Sales Actual Q1 Sales Difference % Difference

A $7,705,668 $9,871,054(###) ###-####683 28%

B $5,188,784 $8,285,872(###) ###-####796 60%

C $9,768,318 $6,265,847 -3502470.75 -36%

D $5,307,556 $693,185 -4614371.382 -87%

E $4,470,576 $6,494,997(###) ###-####968 45%

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This is more of a business statistics question, am I in the right place?

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