Noting that measured support for vouchers seems to vary with question wording, they took the two PDK items as their models and submitted a version of each to separate samples of respondents. (educationnext.org)
A flow meter measured seawater volume, which was pumped through external ports at predetermined times, and multiple 200um - mesh filters retained the plankton from separate samples. (sciencedaily.com)
This analysis, done on separate samples from the same patient, revealed that many of the affected genes confer advantages to cancer cells by, for example, enhancing cell migration or resistance to chemotherapy. (sciencedaily.com)