"wide margin of error" is correct and usable in written English.
You can use it to refer to the amount of leeway or flexibility a measurement has while still being considered accurate. For example: "The measurements have a wide margin of error, so it's difficult to get an exact reading."
The OECD's figure has a wide margin of error.
It certainly accounts for the wide margin of error apparently deemed acceptable in shooting innocent suspects.
Officials cautioned that there was a wide margin of error involved in both calculations.
As such, it comes with a fairly wide margin of error: the researchers are confident that the true number of fatalities is somewhere between 793 and 8,498.
For one thing, Mr. Jackson said, the population survey, which has a wide margin of error, is based on questionnaires handed out at toll booths and may not give an accurate picture of who is using the turnpike.
The final measurements had a wide margin of error: the total carbon dioxide reduction in Beijing during the Olympics was anywhere from 24,000 metric tons to 96,000 metric tons.
Many education experts caution against making such rankings the sole or primary measure of teachers, in part because scores can have wide margins of error and vary widely from year to year.
Because of the difficulty of estimating such figures, however, all of their numbers have wide margins of error.
The reports have wide margins of error and draw on state tests that education officials have acknowledged were flawed.
The public's right to know, the Bloombergians say, outweighs the flaws in the evaluation system, which had wide margins of error and is being replaced.
The problem is that forecasting the future supply of and demand for any type of health professional is a highly complex and nuanced enterprise with wide margins of error (see, for example, Figures 9-1 and 9-6 in my 1991 paper).
