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Why do you standardize normal random variables to find the area under any normal curve?
Wiki User
∙ 13y ago
All Gaussian (Normal) distributions are the same apart from two parameters: the mean and variance. Variables are standardised so as to remove the location effect (of the mean) and the scale effect (of the variance). Then, you need only one table that gives the value of the area under the curve. Otherwise you would need a separate table for each value of the mean and each value of the variance.
The Gaussian curve is not easy to integrate from scratch, and the fact that the standard Normal distribution has been tabulated is immensely valuable to statisticians.
Wiki User
∙ 13y ago
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What is the basis for the normal curve?
The central limit theorem: the arithmetic mean of a sufficient number of independent random variables with means and variances will be a normal random variable. It's just that lots of natural phenomena are like this, or appear to be sufficiently like this. Please see the wikipedia article for more details.
Why is the Gaussian distribution referred to as normal distribution?
Because many naturally occurring variables were approximately distributed according to a Normal bell shaped curve.Because many naturally occurring variables were approximately distributed according to a Normal bell shaped curve.Because many naturally occurring variables were approximately distributed according to a Normal bell shaped curve.Because many naturally occurring variables were approximately distributed according to a Normal bell shaped curve.
How is probability related to the area under the normal curve?
The Normal curve is a graph of the probability density function of the standard normal distribution and, as is the case with any continuous random variable (RV), the probability that the RV takes a value in a given range is given by the integral of the function between the two limits. In other words, it is the area under the curve between those two values.
Is the standard normal curve non symmetrical?
The standard normal curve is symmetrical.
What are the properties of a standard normal curve?
It is a normal curve with mean = 0 and variance = 1.
What is normal probablity curve?
it is a continuous random variable,mound or bell shaped curve
What is the basis for the normal curve?
The central limit theorem: the arithmetic mean of a sufficient number of independent random variables with means and variances will be a normal random variable. It's just that lots of natural phenomena are like this, or appear to be sufficiently like this. Please see the wikipedia article for more details.
Why is the Gaussian distribution referred to as normal distribution?
Because many naturally occurring variables were approximately distributed according to a Normal bell shaped curve.Because many naturally occurring variables were approximately distributed according to a Normal bell shaped curve.Because many naturally occurring variables were approximately distributed according to a Normal bell shaped curve.Because many naturally occurring variables were approximately distributed according to a Normal bell shaped curve.
Why is bell-shaped distribution so common in nature?
It is a consequence of the Central Limit Theorem (CLT). Suppose you have a large number of independent random variables. Then, provided some fairly simple conditions are met, the CLT states that their mean has a distribution which approximates the Normal distribution - the bell curve.
How is probability related to the area under the normal curve?
The Normal curve is a graph of the probability density function of the standard normal distribution and, as is the case with any continuous random variable (RV), the probability that the RV takes a value in a given range is given by the integral of the function between the two limits. In other words, it is the area under the curve between those two values.
Is the standard normal curve non symmetrical?
The standard normal curve is symmetrical.
Normal curve is the meaning of standard normal distribution?
No, the normal curve is not the meaning of the Normal distribution: it is one way of representing it.
Define a normal random variable?
I have included two links. A normal random variable is a random variable whose associated probability distribution is the normal probability distribution. By definition, a random variable has to have an associated distribution. The normal distribution (probability density function) is defined by a mathematical formula with a mean and standard deviation as parameters. The normal distribution is ofter called a bell-shaped curve, because of its symmetrical shape. It is not the only symmetrical distribution. The two links should provide more information beyond this simple definition.
What two variables are plotted on a collector characteristic curve?
What two varibles are plotted on collector charcteristc curve
What are the properties of a standard normal curve?
It is a normal curve with mean = 0 and variance = 1.
What is the area under the standard normal curve?
the standard normal curve 2
What is random distribution in biology?
A random distribution is a random sample set displayed in the form of a bell curve. See random sample set.
