biologgy

[bhcool12]

Can someone explain to me  what the control group, experamental group, independent variable, dependent variable and what constants are?

[Aytex]

 

 

Control group - a group of "things" that you leave constant, in order to compare your experimental results to them. 

Experimental group - another group of "things" that you might change to see the effect your change has. 

Independent variable - the measured things YOU change. 

Dependent variable - the thing that changes in response to your change to the dependent variable. 

This is a ridiculous example, but maybe it will illustrate it for you: 

Say you have a normal block of wood, like a short length of pine 2x4. You want to investigate the effect of painting that wood on the buoyancy of it. So what you do is you take a few pieces of 2x4, the same size, and you leave the first one unpainted. You haven't changed anything about it so it remains your control. Then you paint one side of the next one. And two sides of another one, etc. until you have all six sides painted. Then you drop them all in the water and measure how much the top of the wood sticks out of the water. 

Control group - unpainted wood 

Experimental group - painted wood blocks 

Independent variable - amount of paint 

Dependent variable - amount the wood sinks. 

You could then graph sides painted vs. amount the wood sinks, with the sides painted on the x/horizontal axis and amount of sink on the y/vertical axis. 

I hope that makes sense. Hopefully it answers your question.

 

https://answers.yahoo.com/question/index?qid=20100922141231AAqFgCZ

wonderful search engine named g00gle

[Clear17Mud]

? yes I could but whats in it for me.

[The Official Czex]

Dependent changes due to independent.

 

Constant stays the same throughout the tests.

 

Control group has constants with no independent variable, experimental has constants with independent variable.

[bhcool12]

 Control group - a group of "things" that you leave constant, in order to compare your experimental results to them. 

Experimental group - another group of "things" that you might change to see the effect your change has. 

Independent variable - the measured things YOU change. 

Dependent variable - the thing that changes in response to your change to the dependent variable. 

This is a ridiculous example, but maybe it will illustrate it for you: 

Say you have a normal block of wood, like a short length of pine 2x4. You want to investigate the effect of painting that wood on the buoyancy of it. So what you do is you take a few pieces of 2x4, the same size, and you leave the first one unpainted. You haven't changed anything about it so it remains your control. Then you paint one side of the next one. And two sides of another one, etc. until you have all six sides painted. Then you drop them all in the water and measure how much the top of the wood sticks out of the water. 

Control group - unpainted wood 

Experimental group - painted wood blocks 

Independent variable - amount of paint 

Dependent variable - amount the wood sinks. 

You could then graph sides painted vs. amount the wood sinks, with the sides painted on the x/horizontal axis and amount of sink on the y/vertical axis. 

I hope that makes sense. Hopefully it answers your question.

 

https://answers.yahoo.com/question/index?qid=20100922141231AAqFgCZ

thx for the help. Was studying for finals and forgot what they were

[FAQBytes]

Independent Variable- "I change" This is the thing that is changed in order to test a hypothesis. (Amount of water)

 

Dependent Variable- The things that are changed by the change in the Independent variable. (Height of plant)

 

Constants- As you only want to test 1 Ind. Var. at a time, these are everything else. (Temp, light, location, etc.)

 

Experimental Group- The group that the Independent Variable is imposed on.

 

Control Group- The group not affected by the Ind. Var. that is what is being compared against.

 

Sorry for taking so long.

[Starelementpoke]

Can someone explain to me  what the control group, experamental group, independent variable, dependent variable and what constants are?

Using socks as example:

Experiment: What will make my socks smell worse?

Hypothesis: If I wear the socks longer without washing them, then they'll smell worse.

Control Group: Pair of clean socks, will not be worn. (You keep the control constant so you can compare the experimental group to it)

Experimental Group: Set of currently Clean socks, will wear each various length of time. 1 for one week without wash, another for 2, etc. (The group you use to test, the one said experiment will be tested on)

Independent Variable: The length you wear the socks. (The factor you can change.)

Dependent Variable: How smelly the sock is. (The result of the independent variable)

Constants: Type of sock, what you'll be doing with the sock on, color, etc. (The stuff you have to keep the same, that way margin of error will be decreased)

[Oshino Shinobu]

Control group: A group that aren't receiving treatment, or any action taken on them in regards to the experiment. Used as a benchmark to compare the experimental group against. Without a control group to compare results with, your data from the experimental group is useless. 

 

Experimental group: receives treatment (or whatever you're trying to test). You're looking for how the treatment changes the results when compared to the control group. 

 

Independent Variable: The variable that is changed. Generally, you only have one independent variable, otherwise it can be difficult to establish cause and effect.

 

Dependant Variable: The variable that is measured. It is expected to change in relation to the independent variable. It is called the dependant variable because it depends on the independent variable. 

 

Constant/controlled Variables: Variables that are deliberately kept the same, often to make the results valid by creating fair and consistent conditions for the various situations and groups. Without them, results can be completely useless as you effectively have extraneous variables. 

 

 

That's what I remember from Psychology A Level, but I assume it's the same for Biology.