FRAME 48.

Fourth, the total area under the curve is one or 100%. All the items in the distribution are

represented under the curve. The normal curve represents the shape of all the observations in

the population.

QUESTION:

Are all the elements of a normal population represented by the normal

curve? ____________________________

FRAME 49.

Fifth, the mean and standard deviation completely determine a normal curve. The normal

distribution, is a two-parameter distribution. In order to draw any normal distribution, all we need

are the mean and standard deviation. All normal curves with the SAME mean and standard

deviation are identical. We previously defined standard deviation as a unit of measure of

dispersion. The more spread out the data, the greater the dispersion, and thus the larger the

standard deviation. As the standard deviation gets larger, the normal curve tends to flatten out.

Which of the following normal curves has the larger standard deviation?

CURVE A

CURVE B