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# Mean and Standard Deviation Question Watch

1. Probably seems like silly question but I am that rusty, please bear with me.

Ok so I have this set of data below (its basic but if i can grasp this, ill know what im doing):

Car colours in 2012

Colour / Amount

Red / 10
Blue / 20
Black / 30

Car Colours in 2013

Colour / Amount

Red / 15
Blue / 25
Black / 15

Now I want to compare the difference in Red, Blue and Black cars in 2012 to 2013. Keep in mind one set has 60 cars, the other set has 55 if that matters.

From this, how do I go about working out the median and standard deviation for comparison purposes? Im not sure what parts im supposed to be comparing with each other or anything

Thank you guys!!
2. (Original post by xCarlx)

From this, how do I go about working out the median and standard deviation for comparison purposes?
They're not going to be meaningful in this context.

Im not sure what parts im supposed to be comparing with each other or anything
I suspect you need a Chi-squared test.

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