QuestionAugust 20, 2025

Two students designed an experiment that investigated the effect of different brands of fertilizer on tomato plant growth. There were a total of three groups. Each student treated one group of plants with no fertilizer, a second group of plants with Brand X fertilizer, and a third group with Brand Z fertilizer. Student A planted his tomatoes wherever soil was available. Some were in a spot that was shady most of the day and some were in sunlight; some were in sandy soil and some were in rocky soil; some were in pots and some were in the ground. Student A watered the plants whenever he remembered. Student B planted all of her tomatoes in the same kind of soil, in a location where all the plants received the same amount of light, and made sure that all the plants received the same amount of water on a regular schedule. Which student's results are more likely to be accurate? Student A Why? square square square Which group is the control group? square What are the control variables in the experiment? square POSSIBLE POINTS

Two students designed an experiment that investigated the effect of different brands of fertilizer on tomato plant growth. There were a total of three groups. Each student treated one group of plants with no fertilizer, a second group of plants with Brand X fertilizer, and a third group with Brand Z fertilizer. Student A planted his tomatoes wherever soil was available. Some were in a spot that was shady most of the day and some were in sunlight; some were in sandy soil and some were in rocky soil; some were in pots and some were in the ground. Student A watered the plants whenever he remembered. Student B planted all of her tomatoes in the same kind of soil, in a location where all the plants received the same amount of light, and made sure that all the plants received the same amount of water on a regular schedule. Which student's results are more likely to be accurate? Student A Why? square square square Which group is the control group? square What are the control variables in the experiment? square POSSIBLE POINTS
Two students designed an experiment that investigated the effect of different brands of fertilizer on tomato plant growth. There were a total of three groups. Each student treated one group of plants with no fertilizer, a second group of plants with Brand X fertilizer, and a third group with Brand Z fertilizer. Student A planted his tomatoes wherever soil was available. Some were in a spot that was shady most of the day and some were in sunlight; some were in sandy soil and some were in rocky soil; some were in pots and some were in the ground. Student A watered the plants whenever he remembered. Student B planted all of her tomatoes in the same kind of soil, in a location where all the plants received the same amount of light, and made sure that all the plants received the same amount of water on a regular schedule. Which student's results are more likely to be accurate? Student A Why? square square square Which group is the control group? square What are the control variables in the experiment? square POSSIBLE POINTS

Solution
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Answer

Student B's results are more likely to be accurate. ### The control group is the one with no fertilizer. ### Control variables are soil type, light exposure, and watering schedule. Explanation 1. Identify the accurate results Student B's results are more likely to be accurate because she controlled variables such as soil type, light exposure, and watering schedule, ensuring consistency across all conditions except for the fertilizer brand. 2. Determine the control group The control group is the one treated with no fertilizer. This group serves as a baseline to compare the effects of Brand X and Brand Z fertilizers. 3. Identify control variables Control variables in the experiment include soil type, light exposure, and watering schedule. These were kept constant by Student B to ensure that any differences in plant growth could be attributed to the fertilizer used.

Explanation

1. Identify the accurate results<br /> Student B's results are more likely to be accurate because she controlled variables such as soil type, light exposure, and watering schedule, ensuring consistency across all conditions except for the fertilizer brand.<br /><br />2. Determine the control group<br /> The control group is the one treated with no fertilizer. This group serves as a baseline to compare the effects of Brand X and Brand Z fertilizers.<br /><br />3. Identify control variables<br /> Control variables in the experiment include soil type, light exposure, and watering schedule. These were kept constant by Student B to ensure that any differences in plant growth could be attributed to the fertilizer used.
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