Which of the following sources is most likely to provide the most scientifically rigorous and accurate information? a non-randomized clinical trial with 15,000 subjects a report on a study presented by a news organization a randomized clinical trial with 15,000 subjects an endorsement of a product by a movie star an epidemiological study with 15,000 subjects

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.