measures of central tendency and dispersion

Question 1

measures of central tendency definition

Answer 1

a measure which calculates an average value within a data set

Question 2

how to work out mean

Answer 2

total of all values divide by number of values

Question 3

how to work out mode

Answer 3

most frequently occurring value

Question 4

how to work out median

Answer 4

arrange data from lowest to highest and find the middle value

Question 5

2 strengths of mean

Answer 5

-makes use of all values
-good for interval data

Question 6

limitation of mean

Answer 6

influenced by outliers (extreme scores) so can be unrepresentative

Question 7

2 strengths of median

Answer 7

-not affected by outliers
-good for ordinal data

Question 8

limitation of median

Answer 8

not as sensitive as mean- doesnt use all data

Question 9

strength of mode

Answer 9

good for nominal data

Question 10

limitation of mode

Answer 10

not useful when there are multiple modes

Question 11

dispersion: how to work out range

Answer 11

highest score minus lowest score

Question 12

strength of range

Answer 12

easy to calculate

Question 13

2 limitations of range

Answer 13

-does not use all values
-affected by extreme values

Question 14

dispersion: how to work out standard deviation

Question 15

what is standard deviation

Answer 15

a single value saying how far values deviate from the mean
-larger deviation= greater spread of data
-low deviation= data is clustered close to the mean

Question 16

strength of standard deviation

Answer 16

-precise measure where all values are taken into account

Question 17

2 limitations of standard deviation

Answer 17

-affected by extreme values
-difficult to calculate