what is a Extraneous variable?

Question

please explain what a Extraneous variable as simply as possible

Answer 1

Extraneous Variables are undesirable variables that influence the relationship between the variables that an experimenter is examining. Another way to think of this, is that these are variables the influence the outcome of an experiment, though they are not the variables that are actually of interest. These variables are undesirable because they add error to an experiment. A major goal in research design is to decrease or control the influence of extraneous variables as much as possible.

Say you wanted to work out how clever a fish species were in finding food depending on how long since they had eaten. But if their ability to find food also depended on the temperature of the water and you were not able to either control or measure accurately the temperature of the water. Then the temperature could be described as an extraneous variable.

Answer 2

Extraneous Variable

Answer 3

Define Extraneous

Answer 4

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Heres a hint for future use: IVs always have LEVELS, and are variables manipulated by the experimenter. DVs are always "NUMBER OF" clauses, they are what is being measured by the experimenter. EVs (more commonly known as confounds) are variables beyond the control of the experimenter, that negatively affect the internal and external validity of the experiment in question. Thus for your experiment, the DV is the number of books picked up by either males or females (what you were measuring), there are 2 IVs which are the gender categories (male or female) of participants, and the EVs I cannot say without further information. An example of an extraneous variable may be weather (if it was cold people may be less likely to pick up the book vs. hot weather), or possibly attractiveness of the participants dropping the books (the more attractive the more likely it may be to help) etc. Hope this helps!

Answer 5

A variable is something that can change something. Extraneous means to come from outside. So, If a tree would normally stay standing with little change other than wind to move it around, but a tornado ripped it out of the ground, then that would be an extraneous variable.

Answer 6

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RE:
what is a Extraneous variable?
please explain what a Extraneous variable as simply as possible

Answer 7

An extraneous variable is one that is really rather random or outside the norm, extra if you will. It often can change outcome by an unknown degree. Try to avoid them.

Answer 8

In an ideal experiment, one controls all variables except the one that is manipulated, but in reality one can directly control very few variables.

for instance, we list four variables besides gender that might account for math scores, and we could easily have expanded the list to include dozens more. To control for the possibility that parent's occupation affects math scores, we would have to compare Abigail, whose parents are doctors, with another child of doctors, not with Fred, whose parents are artists. In the extreme, we would have to compare Abigail with a 67'' tall boy who has three siblings, doctors for parents, and is viewed by his teacher as ``an angel.'' And if we could find such an individual, he probably wouldn't have been born in the same town as Abigail, or delivered by the same physician, or fed the same baby food, or dropped on his head on the same dark night that Abigail was. Agreed, this example seems a bit ridiculous, but you can't prove that these factors don't account for Abigail's math scores. So if you take the definition of ``extraneous variable'' literally (i.e., extraneous variables are other possible causes) then the identity of the physician who delivered Abigail is an extraneous variable, and must be controlled in an experiment.

In practice, extraneous variables are not merely ``possible causes''; they are ``plausible causes.'' It is plausible to believe that a teacher's view of a student influences her math scores; it is unlikely that the identity of the physician who delivered the baby who became the student influences her math scores. Thus, we distinguish extraneous variables from noise variables.

Experiments control extraneous variables directly, but noise variables are controlled indirectly by random sampling. Suppose we are concerned that a student's math scores are affected by how many siblings, s, he or she has. We can control s directly or let random sampling do the job for us. In the first instance, treating s as an extraneous variable, we would compare math scores of girls with s = 0 (no siblings) to scores of boys with s = 0, and girls with s = 1 to boys with s = 1, and so on. Alternatively, we can treat s as a noise variable and simply compare girls' scores with boys' scores. Our sample of girls will contain some with s = 0, some with s = 1, and so on. If we obtained the samples of girls and boys by random sampling, and if s is independent of gender, then the distribution of s is apt to be the same in both samples, and the effect of s on math scores should be the same in each sample. We cannot measure this effect--it might not even exist--but we can believe it is equal in both samples. Thus random sampling controls for the effect of s, and for other noise variables, including those we haven't even thought of.

Answer 9

Variables are things that can change during a period of examination, experiment, or formula. For example: if you are looking for the answer to X + 5 = 26, X can only be 21 so it is not a variable. If you are looking for the answer to Xsquared + 1 = 26, then X can be either a +5 or a -5 so it is a variable. An extraneous variable would be a variable that does not really affect the answer or the experiment (as in 'an irrelevant variable').

Answer 10

It could be an unnecessary variable, such as an extraneous third shoe.....Whatchu talkin about, Willis?