Question

Experimental Design Baseline Assessment:

Rosa's Geranium Experiment
Rosa read that plants grow better in acidic soil. She decides to do an
experiment to see if using vinegar will help geranium plants grow
taller. At the beginning, she predicts that vinegar will not make the
plants grow taller.
Rosa starts with nine geranium plants. Each plant is in the same size container with the same
amount and type of soil. Rosa puts all plants on the windowsill in her room so they receive the
same amount of sunlight.
Rosa waters all nine plants on the same days using the same amount of liquid. Three plants are
given 10% vinegar solution. Three plants are given 20% vinegar solution. The last three plants
are given pure water. She measures the height of the plants every week for six weeks. She
also records the color of the leaves and if the plants look healthy or not. Rosa's data is in the
table below.

Answer 1

This question is asking to identify the following variables in the experiment:

Hypothesis: IF vinegar are applied to geranium plants, THEN the plants will not grow taller.

Independent variable: VINEGAR

Dependent variable: HEIGHT OF PLANTS

Constants: SAME AMOUNT OF SOIL, SAME TYPE OF SOIL, SAME SIZE OF CONTAINER, SAME AMOUNT OF SUNLIGHT, SAME AMOUNT OF WATER

Control group: PLANTS GIVEN PURE WATER

Experimental group: PLANTS GIVEN VINEGAR SOLUTION

Step-by-step explanation:

The hypothesis is a testable explanation to an observed problem or question. In this case, the hypothesis as stated by Rosa is: IF vinegar are applied to geranium plants, THEN the plants will not grow taller.

Independent variable is the variable that is changed or manipulated by the experimenter in an experiment. In this case, the independent variable is the VINEGAR.

Dependent variable is the variable being measured by the experimenter. In this experiment, the dependent variable is the HEIGHT OF GERANIUM PLANTS.

Constants are those variables that are kept unchanged throughout the experiment in order not to influence the outcome. In this experiment, the constants are SAME AMOUNT OF SOIL, SAME TYPE OF SOIL, SAME SIZE OF CONTAINER, SAME AMOUNT OF SUNLIGHT, SAME AMOUNT OF WATER.

Control group is the group that does not receive the experimental treatment (vinegar). In this case, the group of PLANTS GIVEN PURE WATER are the control group.

Experimental group are the group that receives the experimental treatment in an experiment. In this case, the experimental group are the group of PLANTS GIVEN VINEGAR SOLUTION