Statistics Describe Distribution

The average distance between each data value and the mean. This is used to describe variation in a data set. It also helps us get a sense of how "spread out" the values in a data set are.

A data value that is unusual in that it differs quite a bit from the other values in the data set. .

• outlier

• statistic

• mean

• symmetric

A value that attempts to describe a set of data by identifying a central position of the data set (as representative of a "typical" value in the set). Ex: mean, median, mode.

• measure of center

• measure of variability

• statistic

• spread

The average of a set of numbers. Calculated by adding up all of the terms and dividing by the number of terms.

The variability of a statistic is described by

• the spread of its sampling distribution. 

• the amount of bias present.

• the different values it will takefrom each of the samples.

• the stability of the population it describes. 

Measures of variability are numbers that describe diversity in the distribution.

• True

• False

What is the range of this data?

• 30

• 40

• 50

• 60

What is the interquartile range?

• The span between the first quartile and the third quartile

• The span between the lowest score and the highest score

• The simplest measure of variability to calculate

• one-fourth of a distribution of scores

How do you calculate Standard Deviation?

• Square the variance

• Divide an ordered data four equal parts

• Square root the variance

• Square the mean

What is the median of the data?

• 7

• 8

• 9

• 8 and 9