Measures of location and spread Flashcards
(11 cards)
What is the mode
most common value
What is the median
middle value when data ordered
What is the mean
value acheived when total spread evenly
What is the mean for ungrouped data
Sum of all values divided by number of values
What is the mean for grouped data
sum of (all frequencies times midpoint) divided by
sum of all frequencies
When can the mode be used
qualitive and quantitive data
however may not exist
When can the median be used
quantitive data
always exists and not affected by outliers
only uses two data points
When can the mean be used
quantitive
truly representative but skewed by outliers
When the median is a non integer what do you do
round to next value
When median is integer what do you do
go halfway between next integer value
What is interpolation and when is it used
assuming even spread throughout the group
used for grouped data
