[Paddlewise] swim or stay with boat

   After chewing on the swim versus stay with boat question, and how the
decision affects survival, it occurs that a 2 by 2 contingency table
analysis would give a nice statistical summary. Create the 4=2x2 cells as
follows: row one is survivors, row two is non-survivors, column one is
people who swam for it, column two is those who stayed with the boat.
So in the 11-cell we have the number who survived and swam, in the 12-cell
we have the number who survived and stayed with the boat, etc.
   If we had the cell counts C11, C12, C21, C22, we could do a chi-square
test (with 1 df) of independence of rows and columns. If the hypothesis
of independence of rows and columns is supported, then the conclusion
would be that probability of survival is the same for swimmers and those
who stayed with the boat. If sample size is too small to do a chi-square
test, we could still use Fisher's Exact Test.
   Maybe you'd rather hear a joke. Rodney Dangerfield, who passed away
recently, was looking at his calendar one day. All of a sudden it hit him
like a ton of bricks. His days were numbered.

BRC
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