The poll of Democratic voters has a sampling error of plus-or-minus 5 percentage points.

CNN: Poll: Bush down, Clark up

The survey of 1, 000 adults was taken Sunday through Tuesday, with a sampling error of plus or minus three percentage points.

CNN: Poll: Americans split on worthiness of war

The results of the poll, conducted nationally by telephone between Friday and Sunday, has a sampling error of plus-or-minus 3 percentage points.

CNN: Poll: Bush down, Clark up

The poll had 1, 538 adult respondents, with a sampling error of three percentage points.

CNN: Poll:?Most?don't blame Bush for flu vaccine shortage

CNN's poll has a sampling error of plus-or-minus 3 percentage points for most questions.

CNN: Bush's approval ratings slide to new low

The decline is within the poll's sampling error of plus or minus 3 percentage points.

CNN: Poll: Bush approval rating dips to 35 percent

When split into parties, the numbers have a sampling error of plus-or-minus 5.5 points.

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Pollsters surveyed 1, 010 American adults, with a sampling error of three percentage points.

CNN: Sikhs repair, reclaim temple after rampage

The poll has a sampling error of plus or minus 3 percentage points.

CNN: Poll findings could be trouble for McCain

The poll had a sampling error of plus or minus 4 percentage points.

CNN: Candidates reach out across New Hampshire

The survey had a sampling error of plus or minus 3.1 percentage points.

CNN: Analysts pore over 'ambiguous' Iran results

That poll questioned 400 likely Democratic primary voters and has a sampling error of plus or minus 5 percentage points.

CNN: 150 delegates up for grabs Tuesday

The poll has a sampling error of plus or minus 4 percentage points on the question of sending a message with votes.

CNN: Poll: Bush approval rating dips to 35 percent

There was little difference in how Democrats and Republicans responded to the poll, which had a sampling error of plus-or-minus 3 points.

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The margin of sampling error is plus or minus 3.5 percentage points.

MSN: Poll reveals baby boomers' retirement fears

Results for the full sample have a margin of sampling error of plus or minus 3.9 percentage points, it is larger for subgroups.

NPR: 50 Years On, Finding Profit In 'Truth' On JFK Case

The Research 2000 poll, which carries a sampling error of plus or minus 3.5 percentage points, also shows 6 percent remain undecided in Missouri.

CNN: McCain, Obama in tight race as debates loom

The poll had a sampling error of plus or minus 4%.

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It has a sampling error of plus or minus 5 percent.

CNN: Poll: Parents aren't watching 'Net-surfing teens

The survey had a sampling error of 4.5 percentage points.

CNN: Kerry decides against 2008 presidential run

It has a sampling error of plus-or-minus 3 points.

CNN: Bush: Give new Iraq strategy 'a chance'

It had a sampling error of 5 percentage points.

CNN: Poll: Obama opens double-digit lead over Clinton

This online survey is not based on a probability sample and therefore no estimate of theoretical sampling error can be calculated.

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The poll of polls does not have a sampling error.

CNN: Most give Obama thumbs up on first 100 days, polls say

As students, you should keep in mind that all these numbers are estimates based on samples, which are thus subject to sampling error (as well as other types of errors).

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The sampling error varied from question to question, but none had a margin of error exceeding 4.5 percentage points.

CNN: Poll: U.S. can win war, but won't