The phrase "a significant and sizable" is correct and usable in written English.
It can be used to emphasize the importance and large extent of something, often in contexts like research findings, financial reports, or descriptive writing.
Example: "The study revealed a significant and sizable increase in the population of the endangered species over the past decade."
Alternatives: "a considerable and substantial" or "a notable and large".
At the end of the intervention, there was a significant and sizable effect on the mathematics posttest for Math Shelf students (Cohen's d = 1.09, p < .001).001
Our results consistently indicate that the increased focus on individual teacher performance caused a significant and sizable relative decline in student achievement, as measured by national exams.
As shown in Table 1, there was a significant and sizable decline in the proportion of minority enrollees and graduates from more "advantaged" family backgrounds after Prop 209 went into effect.
and Mike Lee (R-Utah), recently circulated a letter calling on Obama to put forward a "significant and sizable" reduction in troops in Afghanistan.
This study demonstrated a significant and sizable association between the number of birth complications and psychiatric service contact.
Recognizing this significant and sizable gap, West Health Institute sponsored a daylong event last month called Health Care Innovation Day.
I also find that even after adjusting for several classroom characteristics, significant and sizable quality gaps remain.
According to linear regression results, both education and age explained significant and sizable portions of variances on most of the 3W3S subscale test scores.
On any account, the regressions capturing specific institutional contexts corroborate significant and sizable discrimination against women and the absence of significant double discrimination against foreign women.
Consistent with other studies, the log wage penalty of mismatched (i.e. overeducated) graduates relative to matched graduates was significant and sizable, being 38 log points in 1997 2001.
However, χ is extremely sensitive to sample size, such that small variations in fit can result in statistically significant and sizable χ.
