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How many times does the digit 1 occur in ten place in the numbers from 1 to 1000?
setting
just ten times... in the numbers 50 to 59 inclusive.
When both axis' are increasing it is a positive correlation. When both are decreasing it is a negative correlation. When the dots are all over the place then there is no correlation.
That looks like it should be the same as 10 times (the number of times the digit 1 occursin the units place in the numbers from 10 to 100), which would work out to 90 .