Measures of central tendency and spread Flashcards
1
Q
disadvantages of using the mean
A
sensitive to outliers and not used for data with extreme values i.e. skewed data
2
Q
median
A
middle value when the data is ranked (in numerical order)
3
Q
pros and cons of mode
A
pro: not sensitive to extreme values
con: wasteful of data as it only uses one observation
4
Q
interquartile range
A
the difference between the first and third quartiles
5
Q
positively skewed
A
most values lie at the bottom of the range (tail to the right)
6
Q
negatively skewed
A
most values lie at the top of the range (tail to the left)
7
Q
coefficient of skewness
A
equal to zero if the data is symmetrical, >0 - positive skewness, <0 - negative skewness
8
Q
kurtosis
A
measure of the peakedness of a distribution
