Samantha and Luis are attempting to determine the average number of library books that seventh-grade students check out at one time. Samantha surveys every other seventh grade student leaving the library. She samples a total
of 40 of the 200 seventh graders. Luis samples 30 of the 200 seventh grade students at random in the school
cafeteria. Whose sample is the most random?
O Luis because his sample is taken from the population of all seventh graders
O Luis because he samples fewer students
O Samantha because she samples more students
• Samantha because her sample is taken from the population of students who use the library

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.