Respuesta :
Hyp: If mosquitos are exposed to a higher pesticide concentration, their mortality rate will increase. Ind.var: Drops of pesticide (2, 4, 6, 8). Dep. var: Mosquitos' mortality. Const. var: larvae, mL of water per vial, and temperature. Exp groups: Mosquitos in vials A, B, C, D. Control group: Mosquitos in vial E.
What are de dependent and independent variables?
Independent variables are those modified or changed by the researcher to study how this change affects another variable and hence the results.
This variable is not affected by any other one but influences or causes a reaction in other variables.
The dependent variable is the one influenced by the independent variable, and is affected by any change on this last one.
Its response might be either directly proportional or inversely proportional to the change in the independent variable.
Controlled variables are kept constant in the control groups and the experimental groups. Unlike the independent variable, the controlled variables do not influence the results.
These variables do not affect the response of the dependent variable.
What is a hypothesis?
A hypothesis is a scientific conjecture, not verified, that requires corroboration. The researcher hypothesizes to predict what is expected to occur.
The hypothesis is a claim of how it works a relationship between two or more variables. The exposed relationship must be logical and clear.
What are the control and experimental groups?
During an experiment, the researcher compares at least two groups: a control group and an experimental group. Both groups are composed of individuals coming from the same population, so they are identical in all aspects except for the independent variables.
• The control group is used to identify any other factors influencing the results obtained in the study, apart from the modified variables of the treatment. The independent variable keeps constant in the control group.
• The experimental group receives the treatment. The researcher voluntarily changes the values of the independent variable to observe how it affects the individuals subjected. There can be several experimental groups.
In the exposed experiment,
Goal: To test the effectiveness of a pesticide
Independent variable: Drops of pesticide (2, 4, 6, 8)
Dependent variable: Mosquitos' mortality
Controlled constant variables: mosquito's developmental stage (larvae), 20 mL of water per vial, and temperature of 25° C.
Hypothesis: If mosquitos are exposed to a higher pesticide concentration, their mortality rate will increase.
Experiment:
- Vial A 2 drops of pesticide
- Vial B 4 drops of pesticide
- Vial C 6 drops of pesticide
- Vial D 8 drops of pesticide
- Vial E 0 drops of pesticide
Experimental groups: Mosquitos in vials A, B, C, D
Control group: Mosquitos in vial E.
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