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View Diary: So, about that CNN Snap Poll (290 comments)

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  •  A sample size of 430 people creates a MoE of 4.7% (0+ / 0-)

    which is pretty high, but acceptable.  But as we've discussed, it makes the crosstabs mostly useless.  I'm guessing CNN polled such a small sample so they could complete the snap poll and breathlessly announce the results as quickly as possible.

    Normally pollsters use a sample size of at least 1,000 or so for a national poll.  You usually only see samples of 400-500 in state polls.

    •  ok, so that MOE (2+ / 0-)
      Recommended by:
      wishingwell, tiredntexas

      Makes any change in approval ratings essentially meaningless.
      I still believe there was some kind of selection bias in this poll, but as mentioned elsewhere, Nielsen would tell us if that is true.  

      Do you know if you need a subscription to get that data?

      "We have always known that heedless self-interest was bad morals; we know now that it is bad economics" - F.D.R.

      by biscobosco on Thu Oct 04, 2012 at 02:34:49 AM PDT

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    •  note it was a subsample from a previous poll (0+ / 0-)

      Offhand I would guess they attempted to reinterview everyone from that poll who was qualified and willing.

      We should be grateful to them for that, since it gives us an interesting result: the candidate favorables hardly budged.

      Election protection: there's an app for that!
      Better Know Your Voting System with the Verifier!

      by HudsonValleyMark on Thu Oct 04, 2012 at 03:47:18 AM PDT

      [ Parent ]

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