The phrase "an unrepresentative sample" is correct and usable in written English.
It can be used in contexts related to research, statistics, or data analysis when discussing a sample that does not accurately reflect the characteristics of the larger population.
Example: "The findings of the study may be flawed due to the reliance on an unrepresentative sample of participants."
Alternatives: "a biased sample" or "a non-representative sample".
This, sadly, is not an unrepresentative sample of Wenzel's prose.
They will stand accused of being an unrepresentative sample, which they are, and holding disproportionate influence, which they do.
The court of appeal concluded that those of the appellant's statements which he tried to refute could not be discounted as an unrepresentative sample of his utterances.
Epidemiologic research may be affected by patchy data resulting in an unrepresentative sample, selection bias, misclassification, and confounding by factors associated with testing for and recognition of reduced kidney function.
Nor is this an unrepresentative sample; "whole" appears 20 times in the essay, so frequently that it begins to seem not just sloppy and imprecise but argumentatively, even aggressively, disingenuous.
It is hard to contend that an unrepresentative sample of 60,000 Virginians says very much about national politics, any more than does the fact that similarly small numbers of people reelected allegedly endangered Republicans in states such as South Carolina.
An investigation showed that the poll used an unrepresentative sampling, skewed to disproportionately include those people most likely to take a negative position.
From an entirely unrepresentative sample of my friends – all of us being those awful London media snobs you love to hate – I'm not alone.
However, the main purpose of this study has been to analyse the associations between perceived parenting and indicators of parental and family characteristics, and associations estimated from a somewhat unrepresentative sample will seldom diverge dramatically from those found in an entirely representative sample.
It was based on a small, unrepresentative sample.
But the extent of decline varies from pilot to pilot, Dr. Morrow said, and as less-proficient fliers leave the field, those remaining are "a smaller, unrepresentative sample of excellent adults".
