margin of safety
safety margin
margin of error

The average margin of error for the year so far is 121,000.

However, this value is close to the margin of error.

They don't know what it means when a result is within the margin of error.

"And what would you say was the margin of error?"

There had been no margin of error built into the plan in case things went wrong.

However, often only one margin of error is reported for a survey.

Obviously the figure is subject to a margin of error.

Again, the result was negative within the margins of error.

However the margin of error for this result is relatively large.

No information was provided on the margin of error in the survey.