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Damned Data, just the way you want it!

June18

Lies, damned lies and statistics! This interview focuses on the rapidly changing New Zealand property market, but don’t let that put you off! The first half has strong statements about the way companies use (er, “manipulate”) data for their own ends! Why do two companies have different results from the same data? Who controls the way that data is interpreted? Watch on, dear mathematicians!
Herald_Data

 

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NCEA Level 2 Algebra Problem. Using the information given, the shaded area = 9, that is:
y(y-8) = 9 –> y.y – 8y – 9 =0
–> (y-9)(y+1) = 0, therefore y = 9 (can’t have a distance of – 1 for the other solution for y)
Using the top and bottom of the rectangle,
x = (y-8)(y+2) = (9-8)(9+2) = 11
but, the left side = (x-4) = 11-4 = 7, but rhs = y+? = 9+?, which is greater than the value of the opp. side??
[I think that the left had side was a mistake and should have read (x+4)?]

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