03-10-2012, 01:14 PM
Normal Distribution
Normal Distribution1.ppt (Size: 281 KB / Downloads: 49)
The Normal Curve
The shape of the normal curve is often illustrated as a bell-shaped curve.
The highest point on the normal curve is at the mean of the distribution.
The normal curve is symmetric.
The standard deviation determines the width of the curve.
The total area under the curve the same as any other probability distribution is 1.
The probability of the normal random variable assuming a specific value the same as any other continuous probability distribution is 0.
Probabilities for the normal random variable are given by areas under the curve.
Standard Normal Probability Distribution
A random variable that has a normal distribution with a mean of zero and a standard deviation of one is said to have a standard normal probability distribution.
The letter z is commonly used to designate this normal random variable.
The following expression convert any Normal Distribution into the Standard Normal Distribution