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Re: [OM] IMG: The Red Carpet

Subject: Re: [OM] IMG: The Red Carpet
From: Moose <olymoose@xxxxxxxxx>
Date: Fri, 30 Oct 2015 16:48:59 -0700
On 10/29/2015 7:11 PM, Mike Gordon via olympus wrote:
        Fifty Fifty Moose and Chuck write:

On 10/28/2015 6:46 PM, Chuck Norcutt wrote:

<<Well, it surely seems that 1/2 of them have fallen bottom side up.

<<<<Odd that, coins seem to do the same thing. :-)

Are you both really  so sure falling Sugar Maple leaves are statistically 
equivalent to tossing  a fair coin? Many aerodynamic and structural variables 
affect their falling one side up or the other,
but they all start in one orientation perhaps skewing the distribution. Haven't 
you observed some floating down in calm conditions remaining red side up? A 
stiff breeze would likely randomize the falling
but under calm conditions is it not reasonable to hypothesize a slight 
preponderance of the red side up?   So how to test:  Perhaps mark off a fixed 
area and  count all the leaves in each orientation.
  A back of the envelope 2X2 table  (df thus=1) would dictate a chi square of 
about 3.9  to assure p<0.05 testing for a 45/55 distribution vs 50/50.  That 
would take roughly 400 leaves.

Over the last month, we've tromped through woods with increasingly deep carpets of fallen leaves. Our sample is in the millions, but our sampling woefully casual. I'm sticking with 50/50. ;-)

Standing Pat Moose

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