The phrase "a relatively wide variation" is correct and usable in written English.
It can be used when discussing differences or changes that are considerable but not extreme in nature.
Example: "The study revealed a relatively wide variation in the results across different demographics."
Alternatives: "a fairly broad range" or "a moderately large difference".
British research has noted, however, that there is a relatively wide variation of phytonutrients between blackcurrant cultivars.
However, the expression of these genes showed a relatively wide variation from patient to patient (see cluster analysis visualised in Figure 8).
At this age, all MLP-KO mice suffer from a significant dilation including EH-myomesin up-regulation, whereas the β-catenin c∆ex3 animals show a relatively wide variation in LV systolic volume.
This may be highlighted by the relatively wide variation in the proportion of each grade in published series.
Due to the relatively wide variation in climate, soil, altitude etc. within this limited area, the total number of plant species is quite large.
Allowing for the difference in data collection methods, there was relatively wide variation in performance related to processes of diabetes care across the five countries.
Aggrecan mRNA levels showed relatively wide variation between samples taken from animals in the same study group, and median values tended to be slightly lower in osteoarthritic samples than in control samples.
In some cases we observed relatively wide variations in NKp30L and NKp44L expression when repeatedly staining the same cell line (see MDA-435 in Fig. 3B or Shep in Fig. 4A).
The relatively wide variations observed in facility-level Hb measurement and ESA dose adjustment frequencies suggest that physicians exercise a significant level of control over these practice patterns in their individual units.
The performance of the correlation has been evaluated over a relatively wide range of IFT and velocity variations.
Both the 17 and 20 mm versions worked well, which suggests a relatively wide bandwidth and a high tolerance to small variations in manufacture like dielectric constant of the PCB substrate.
