measures of central tendency and dispersion Flashcards
1
Q
what are the measures of central tendency
A
1) mean
2) median
3) mode
2
Q
what are the measures of dispersion
A
1) range
2) standard deviation
3
Q
what is the mean
A
the mathematical average in a data set
4
Q
what is the mode
A
the most frequently occurring value in the data set
5
Q
what is the median
A
the middle value of the data set when data is placed in rank order
6
Q
what is the range
A
the difference between the highest and lowest items in the data set
7
Q
what is the standard deviation
A
shows the amount of variation in a data set by showing the spread around the mean
8
Q
evaluate using the mean
A
+ most sensitive measure of central tendency as it takes into account the exact distance between data in the set
- can be easily distorted by extreme values making it unrepresentative of data
- cant be used for nominal data
