2006-11-11 14:42:19 · 7 answers · asked by matzt60 1 in Science & Mathematics ➔ Mathematics
You never know you've got a representative sample unless you have everyone. Random sampling gets you close, but there's always some variation from sample to sample. So, how close do you want your sample statistic to be to the population parameter, and how sure do you want to be that you've done that? Then the answer depends on the manner in which the sample was taken.
Most polls done by organizations like Gallup use something that works close enough to a simple random sample to use that model, and a sample size of around 1200 - 1500 gets you pretty close to a margin of error of 3%. That means that if 100 samples were taken (they're not, but If they were) about 95 of them would be within 3% of the population parameter.
2006-11-11 15:51:04 · answer #1 · answered by MathGuy 3 · 0⤊ 0⤋
"Is there good evidence the Earth is warming?" That become the question asked of evangelists? Is that meant to be suitable to the question of AGW. Is that how alarmists help their arguments?
2016-11-23 16:31:06 · answer #2 · answered by ? 4 · 0⤊ 0⤋
It really depends on what statistic you are trying to derive.
2006-11-11 14:50:06 · answer #3 · answered by Anonymous · 1⤊ 0⤋
280 million
2006-11-11 14:59:22 · answer #4 · answered by Steady As She Goes 2 · 0⤊ 0⤋
To be completely accurate..... eveyone in the US. Everything else is based on assumption.
2006-11-11 15:31:02 · answer #5 · answered by leprechaun 2 · 0⤊ 0⤋
just one, me, because i am america and represent america more than anyone else.
2006-11-11 14:48:35 · answer #6 · answered by bob john 1 · 0⤊ 1⤋
1,000
2006-11-11 14:52:21 · answer #7 · answered by Count Acumen 5 · 0⤊ 0⤋