The phrase "a reliable sample" is correct and usable in written English.
You can use it when referring to a sample that is trustworthy or dependable, often in the context of research or data collection.
Example: "In our study, we ensured that we collected a reliable sample to draw accurate conclusions from our findings."
Alternatives: "a trustworthy sample" or "a dependable sample."
It is possible that these New Yorkers were not a reliable sample of Americans.
Polls of political party electorates are known to be hard to gather a reliable sample size.
They cost at least $500 to test, a process that involves several steps, including determining whether there's sufficient material from which a subsequent DNA test may derive a reliable sample.
Given that bloggers are probably a skewed section of the population - skewed towards the nerdy, get-a-life end of the spectrum, more male than not, in the younger age brackets - they are not a reliable sample of anything other than themselves.
Putting aside the issue of whether 18 British Muslims make up a reliable sample, it can be hypothesised that it is more likely that jihadism might be a reaction against the critical scientific approach that denies the veracity of many of the events in the religious texts.
A rule-based method was developed to automatically identify a reliable sample of winter wheat field time series, and to infer the corresponding sowing dates.
Furthermore, these additives facilitated a reliable sampling procedure during the process.
This acoustic study in the Gironde estuary was used to validate a reliable sampling mobile design.
Although smaller than the cut plots, plot sampling sizes for temperate old-growth forests have been traditionally considered adequate with at least 500 m2 in Chile (Prodan et al. 1997) and elsewhere (Lombardi et al. 2015), so the plots used in this study provide a reliable sampling of the variables tested.
In view of the lack of accurate data on the prevalence and causes of MSI, we worked with the Ministry of Health of Rwanda to develop a survey of MSI of all ages that involved a reliable sampling methodology and a case definition and diagnostic criteria that could clearly map onto the classification system used in the ICF.
HDSS provides a reliable sampling frame and a high response rate is usually observed.
