Answer and Explanation:
The. What is the hypothesis in this situation? The water from the city's water supply contains contaminants that harm the palntas. A hypothesis is an assumption about a certain phenomenon, which must be tested by a scientific experiment that shows that the hypothesis is true or false.
B. Which group of plants is the experimental group? The control group? The plants that received water from the city supply are the experimental group, while the plants that received distilled water are the control group. The experimental group is the one that receives the element that will be tested in the experiment, while the control group is the group that does not receive this element, but receives a neutral element that will not cause any changes in the natural form of that group.
c. What method did the researcher use to randomly assign the groups? A randomized block design was used, where the researcher divides the research elements into homogeneous groups with the same number of elements in each group.
d. How was double blind procedure used? This procedure was used when neither the researcher nor the studied plants knew the composition of the water used. This type of procedure occurs when neither the researcher nor the research object knows the variable being tested at the moment.
e. What was the Independent Variable? The Dependent Variable? The independent variable is the water in the city reservoir, while the dependent variable is the occurrence of degradation of the plants that were irrigated by this water.
f. What is the Operational Definition of the Independent Variable? The Dependent Variable? Independent variable is one that influences other variables for the appearance of a result. Dependent variable is that which is influenced to promote a measured result.
g. What possible confounding variables might the researcher not have taken into account? The composition of the soil where the plants were planted and the incidence of light can be a confusing variable. A confounding variable is one that is neither a dependent variable nor an independent variable, but can influence the results of the experiment.
