Normal Distribution, Confidence Intervals for the Mean, and Sample Size

Continuous Probabilities:

Normal Distribution, Confidence

Intervals for the Mean, and Sample Size

The Normal Distribution

Normal (Gaussian) distribution: a symmetric distribution, shaped

like a bell, that is completely described by its mean and standard

deviation.

Mean or

x

Tail

Every distribution has 2 tails.

Standard Deviation or sd

? There are an infinite number of normal curves.

? To be useful, the normal curve is standardized to a mean

of 0 and a standard deviation of 1.

? This is called a standard normal curve.

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