If I have this set of numbers: [9,7,5,5,4,4,4,2]
We know that:
mean = 5
variance = 4
standard deviation = 2
But is there an application/formula of standard deviation to give us a hint that the trend of the numbers is downwards?
2026-03-31 04:27:28.1774931248
Applications of mean and standard deviation
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If you let these numbers be $y$ values and allow corresponding $x$ values to be $1,2,3...$ and paired in sequence with the $y$ values, you could calculate the PMCC or the equation of the regression line.