Normal Distribution Review

Front

What does σ represent?

Back

Population/distribution standard deviation.

Front

What percent of the data is within one standard deviation of the mean in a normal distribution?

Back

68%.

Front

What percent of the data is within two standard deviations of the mean in a normal distribution?

Back

95%.

Front

What percent of the data is within three standard deviations of the mean in a normal distribution?

Back

99.7%.

Front

In a normal distribution, what can be said about the mean, median, and mode?

Back

They are all equal.

Front

What is the shape of a normal distribution curve?

Back

Bell-shaped.

Front

What does the area under the normal distribution curve represent?

Back

The total probability, which equals 1.

Front

If a data set is normally distributed, what can be inferred about the data?

Back

It follows the empirical rule (68-95-99.7 rule).

Front

What is the significance of the standard deviation in a normal distribution?

Back

It measures the spread or dispersion of the data.

Front

What happens to the normal distribution curve as the standard deviation increases?

Back

The curve becomes wider and flatter.