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There are 3 different variable. The independent variable is what you will be changing in the experiment and there should only be one. The dependent variable is what you will be measuring or observing. The controlled variable is what you will be keeping the same and there can be more than one. There is no limit on how many controlled variables you can have.
There is no limit to the number of variables a formula can have.
There is no limit to the number of variables a formula can have.
There is no limit to the number of variables.
It is recommended to only have one experimental variable in a scientific study to properly isolate its effects and draw valid conclusions. Multiple variables can complicate the results and make it difficult to determine which variable is responsible for the observed effects.
To understand this you need to remember that the independent variable is a condition that you can change, and the dependent variable is the outcome that you see. If you have two independent variables, and you change both during an experiment, how are you going to tell which one caused the change to the outcome? So, you only change one independent variable at a time.
Redi showed the need to limit/control outside variables when he covered 1/2 the jars and got different results than the uncovered.
Ecologists study complex and interconnected natural systems that are influenced by numerous variables. This complexity can make it challenging to isolate and control all relevant factors in an experiment. Additionally, ethical and logistical constraints may limit the ability to manipulate certain variables in a controlled setting.
T. V. Arak has written: 'Uniform limit theorems for sums of independent random variables' -- subject(s): Distribution (Probability theory), Limit theorems (Probability theory), Random variables, Sequences (Mathematics)
The Central Limit Theorem (abbreviated as CLT) states that random variables that are independent of each other will have a normally distributed mean.
Nixon
it is difficult to control all variables except the one being tested