1.3 Measures of Center

resistant

A statistic that is not affected by outliers

mean, trimmed mean, median

Put the following in order from least to most resistant: mean, median, trimmed mean

True

True or false: Unlike the mean, the median is a resistant measure of centers

True

True or false: x̅ is a statistic and μ is a parameter

Bimodal

a data set that has two different modes

weighted mean

a method of calculating the mean where some data points contribute more than others; commonly uses the frequency

Outlier

a number that has an extreme value when compare with most of the data

Percentile

a statistic that identifies the percentage of the data that is less than the given value

mean

numerical balancing point of a data set; average

Midrange (mid extreme)

the mean of the maximum and minimum values of a data set

n% trimmed mean

the mean that results from removing a fixed percentage of data (half of the percentage from each end)

trimmed mean

the mean that results from removing the maximum and minimum values

Median

the middle number in an ordered data set

Mode

the most frequently occurring number in a data set

Frequency

the number of times a data value occurs