The error margin is higher for subgroups, since their sample size is smaller. Given customary subgroup sizes, for 800 whites the error margin would be plus or minus 3.5 points; for 560 women ...

How well the sample represents the population relies on two important statistics – the survey’s margin of error and confidence level. They tell us how well the spoonfuls represent the entire pot.

Prob chart. For both lines, the slope is greatest near 50%. Reading off the chart, the probability of winning with a poll of sample size 1100 is around 25% if the poll result was 49%, but improves ...

As the director of the Quinnipiac University Poll, which has been taking the pulse of the public on policy issues and elections for the past 30 years, I’ve noted that people have been paying ...

Some of the better-known statistical rules of thumb that a smart consumer might think apply in polls are more nuanced than they seem. In other words, as is so often the case in life, it’s complicated.

Margin of Error CBS Elections and Surveys Director Anthony Salvanto discussed the idea of margin of error and how sampling error should be interpreted in polling data.

Based on the sample size (and some other factors) and utilizing statistics, the pollster can calculate the margin of sampling error.

Based on the sample size (and some other factors) and utilizing statistics, the pollster can calculate the margin of sampling error.

Selecting a random sample from a set is simple. But what about selecting a fair random sample from a set of unknown or indeterminate size? That’s where reservoir sampling comes in, and [Sam ...

Instead, it was 5.8 — the margin of sampling error, in percentage points plus or minus. That’s a big MOSE! How big?