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The phrase "a sample of approximately" is correct and usable in written English.
It can be used when referring to a sample size or quantity that is not exact but is close to a certain number or amount.
Example: "In our study, we collected a sample of approximately 100 participants to ensure a diverse representation."
Alternatives: "a sample of about" or "a sample of roughly".
Exact(60)
A sample of approximately 800 residents was chosen and a face to face interview was conducted using a hypothetical open ended question designed to elicit the respondents WTP.
Using a sample of approximately 150,000 employee reviews, we extract both employees' explicit assessments of outlook and a measure of their latent outlook derived from factor analysis.
Here we conducted a large-scale genetic association analysis of educational attainment in a sample of approximately 1.1 million individuals and identify 1,271 independent genome-wide-significant SNPs.
We have therefore undertaken an examination of a sample of approximately 6000 pieces, divided fairly equally between three assemblages: the Amudian and the Yabrudian from the shelf area, and the hearth area (which is Amudian).
This paper examines the value of the bill savings that customers receive under net metering, and the associated role of retail rate design, based on a sample of approximately two hundred residential customers of California's two largest electric utilities.
In research that will be published later this year, I used a survey experiment conducted on a sample of approximately 3,000 Americans to examine how different advisers' statements about a hypothetical conflict affected public support for war and presidential approval.
We obtained a sample of approximately 7,300 households.
We felt we needed a sample of approximately 20,000 names.
The gardenhose provides a sample of approximately 10% of the entire Twitter corpus in a machine-readable format.
A sample of approximately 10 mg of PMNC was immersed in aqua regia (1 mL) to completely dissolve Ag-MNPs.
Conducted annually since 1993, it is a large sample survey that interviews a sample of approximately 50,000 people in about 20,000 households.
More suggestions(13)
a sample of about
a sample of around
a length of approximately
a stake of approximately
a sample of almost
a premium of approximately
a maximum of approximately
a depth of approximately
a decline of approximately
a reduction of approximately
a cost of approximately
a total of approximately
a group of approximately
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com