measures of cnetral tendency and dispersion- research methods

Question 1

mean

Answer 1

average
calculated by adding up all scores or values in data set and dividing figure by total number of scores there are
most sensitive of measures as it includes all scores- more representative of data as whole
esasily disortered by extreme values

Question 2

median

Answer 2

middle value in data set when scores arranged from lowest to highest
extreme values do not affect it
easy to calculate
less sensitive than the mean-lowest and highest values ignored but may be important

Question 3

mdoe

Answer 3

frequently occuring score or value within data set
easy to calculate
crude measure
several modes-not useful
for some data only method an be used

Question 4

range

Answer 4

taking lowest value from highest value and adding 1
easy to calculate
only takes nto account the two ost extreme values and this may be unrepresentative
does not indicate whether most numbers closely grouped around mean or spread out

Question 5

standard deviation

Answer 5

single value tells us how far scores deviate from the mean
larger standard deviation greater dispersion or spread- not all pps affected b iv in the same way because data widely spread
low standard deviation-daa slightly clustered around the mean all pps responded in similar way
more precise measure includes all values
can be distorted by extreme values