How do you set up a controlled experiment ?
What's the purpose of a control group?
How many variables should a controlled experiment have?
What are the difference between observation and inferences?
I REALLY NEED HELP!!!!
PLEASE HELP ME !!!!
Check your book. Then post what you think are answers.
We'll be glad to check your answers.
Here is my answer for the first one
I set up a controlled experiment by getting all matirals that I need for my experiment and then using the scientific method to do my experiment.
Im working on the others
You described an experiment. What makes this experiment a "controlled experiment?"
http://www.biology-online.org/dictionary/Controlled_experiment
I got it covered already ;)
I can definitely help you with your questions! Let's break them down one by one:
1. How do you set up a controlled experiment?
To set up a controlled experiment, you'll need to follow these steps:
a. Identify the problem or question you want to investigate.
b. Formulate a hypothesis, which is an educated guess about the answer to your question.
c. Identify the independent variable, which is the factor that you will deliberately manipulate or change in the experiment.
d. Determine the dependent variable, which is the factor that you will measure or observe to see how it responds to changes in the independent variable.
e. Create two or more groups: an experimental group (where you manipulate the independent variable) and a control group (where you keep all factors constant and do not manipulate the independent variable).
f. Ensure that the control group is similar to the experimental group in all aspects except for the independent variable.
g. Conduct the experiment, making sure to keep all other variables constant, and record the dependent variable.
h. Analyze the data and draw conclusions based on the results.
2. What's the purpose of a control group?
The purpose of a control group in a controlled experiment is to provide a baseline for comparison. By keeping all variables constant and not manipulating the independent variable in the control group, it allows you to observe any changes or effects solely due to the manipulation of the independent variable in the experimental group. The control group helps differentiate between the effects of the independent variable and other factors that could possibly influence the dependent variable.
3. How many variables should a controlled experiment have?
In a controlled experiment, it's important to control as many variables as possible, except for the independent variable you are testing. Ideally, you want to have only one independent variable to ensure clarity and accuracy in your experiment. This allows you to determine the cause-and-effect relationship between the independent variable and the dependent variable. However, there might be situations where it's necessary to have more than one independent variable, in which case you should make sure they are controlled and properly accounted for in your experiment.
4. What are the differences between observation and inference?
Observation refers to directly perceiving or noticing something through the senses or instruments. It involves gathering data or information by making factual and direct observations of events, objects, or phenomena. Observations are objective and can be verified by others or through repeated measurements.
On the other hand, inference is the act or process of drawing conclusions based on observations or previous knowledge. It involves making an educated guess or interpretation about the meaning or cause behind the observed data or phenomena. Inferences are subjective and can vary depending on individual perspectives or interpretations.
I hope this helps! If you have any more questions, feel free to ask!