Normal Distribution Vocabulary

Front

In a normal distribution, approximately ______% of the data items fall within 1 standard deviation of the mean.

Back

68

Front

In a normal distribution, approximately ______% of the data items fall within 2 standard deviation of the mean.

Back

95

Front

In a normal distribution, approximately ______% of the data items fall within 3 standard deviation of the mean.

Back

99.7

Front

A z-score describes how many standard deviations a data item in a normal distribution lies above or below the _________?

Back

mean

Front

If n% of the items in a distribution are less than a particular data item, we say that the data item is in the nth ________ of the distribution.

Back

percentile

Front

The mean, median, and mode of a normal distribution are all equal.

Back

True

Front

In a normal distribution, the z-score for the mean is 0.

Back

True

Front

The z-score for a data item in a normal distribution is obtained using z-score = (data item - standard deviation)/mean.

Back

False

Front

A score in the 50th percentile on a standardized test is the median.

Back

True