measures of central tendancy

Question 1

3 measures

Answer 1

mean
median
mode

Question 2

mean

Answer 2

the average value of all numbers

Question 3

+/- mean

Answer 3

sensitive and includes all values

may be unrepresentative

Question 4

median

Answer 4

middle value in a data set
2 middle values divided by 2

Question 5

+/- median

Answer 5

not affected by anomalies

less sensitive - ignores most values

Question 6

mode

Answer 6

most frequent value in data set

Question 7

+/- mode

Answer 7

relevant to categorial data

overly simple - can be unrepresentative

Question 8

2 measures of dispersion

Answer 8

Range
standard deviation

Question 9

range

Answer 9

the difference between the highest and lowest values

Question 10

+/- range

Answer 10

easy to calculate

does not account for the distribution of scores

Question 11

standard deviation

Answer 11

measure of the spread around the mean - the larger the standard deviation, the more spread out the data is

Question 12

+/- standard deviation

Answer 12

more precise as it uses all values

may be distorted by extreme values