AccelePrep for the ACT Test 2nd Edition Student Text

C HAPTER 11 | H YPER P REP S CIENCE • 213

2. Which of the following results would indicate that the antibiotics being tested have nothing to do with the control of bacterial growth? F. A clear, 2” region was always observed around the disks soaked in water. G. All results remained the same at the two experimental temperatures and at the two antibiotic concentration levels. H. Plates A and B always remained clear. J. The disks soaked in water were not used in the experiments at all. Evaluating Data items involve relating the experimental results to proposed hypotheses. These items might ask how the experiments can be ƒŽ–‡”‡† –‘ –‡•– ƒ ‡™ Š›’‘–Š‡•‹• ‘” ˆ‘” –Š‡ ‹†‡–‹ϐ‹…ƒ–‹‘ ‘ˆ –Š‡ Š›’‘–Š‡•‹• that is best supported by a particular experiment. If redesigning an experiment to test a new hypothesis, identify which variable is to be investigated and which ones should be held constant. For the correct description of the new experimental methods, only the investigated factor will vary in value. If identifying which hypothesis is best supported by an experiment’s data, compare each choice to †‡–‡”‹‡ –Š‡ Š›’‘–Š‡•‹• ‘•– •’‡…‹ϐ‹…ƒŽŽ› †‡•…”‹„‡† „› –Š‡ ƒ…–—ƒŽ experimental methods and reported data trends. Š›’‘–Š‡•‹• ˆ‘” –Š‡ ‡ƒ” ‘†‡Ž ‡šƒ’Ž‡ –Šƒ– •ƒ›• •‘‡–Š‹‰ ƒ„‘—– ϐŽ‡š‹„Ž‡ membranes on round frames would be better than one that discusses ϐŽ‡š‹„Ž‡ ‡„”ƒ‡• ‘ ˆ”ƒ‡• ‹ ‰‡‡”ƒŽǤ ‹…‡ –Š‡ ‡š’‡”‹‡– ‹• •’‡…‹ϐ‹… –‘ ”‘—† ˆ”ƒ‡•ǡ –Š‡ ϐ‹”•– Š›’‘–Š‡•‹• ‘”‡…Ž‘•‡Ž› †‡•…”‹„‡• –Š‡ ƒ…–—ƒŽ experiment and is therefore the better choice. 3. Which hypothesis best explains the observation that the agar plates never appear clear beyond a 2” area surrounding the soaked paper disks? A. The bacteria cannot grow well within 2” of any moist paper disks. B. The antibiotics cannot seep through the agar beyond a distance of 2”. C. At the experimental incubation temperatures used, the two antibiotics interfere with each other’s effectiveness. D. The paper disks can absorb nutrients out of the agar from the distance of 2”.

EVALUATING DATA

Examples: