Question

The student performed an experiment to test his hypothesis about sunlight and plant height using two plants. He kept everything the same between two tomato plants except he exposed them to different amounts of sunlight. He also used a third plant as a control group, or a group in which no variables are manipulated to confirm the results. Roberto critiqued the work. Which problem did Roberto most likely identify?

Answer 1

His sample size is too small

Step-by-step explanation:

Not anywhere in the excerpt does it say that he is using trials and averaging the data. this trial could've been a flop, but he wouldn't know due to the lack of trials

Answer 2

He needs to keep everything the same — or controlled — in the control group plant and the experimental plants, so that the only difference between the groups is the amount of sunlight that they get.