mean, median, mode, range, statistical infrequency

Question 1

mean strength and weakness

Answer 1

+the data is more representative
-the mean can be easily distorted by extreme values

Question 2

median strength and weakness

Answer 2

+ extreme values do not affect the median value
-it doesn’t take all sets of data into consideration =there less sensitive than the mean=less representative

Question 3

mode strength and weakness

Answer 3

(best to use when dealing with categories)
+not affected by extreme values
-not representative of the data as a whole
-could be more than one mode
(bi-modal)=two modes

Question 4

range strengths and weakness

Answer 4

+easy to calculate
+numbers that are close e.g 12,13,14=representative
-only takes into account the two most extreme values.

Question 5

mean

Answer 5

the average calculated by adding up all the values in a set of data and dividing by the number of values there are

Question 6

median

Answer 6

the central value in a set data when value are arranged from lowest to highest

Question 7

mode

Answer 7

the most frequently occurring value

Question 8

central tendency

Answer 8

the statistical measure that identifies a single value as representative of an entire distribution- the main measures are mean ,median and mode

Question 9

standard deviation

Answer 9

the single value that tells us how far each score deviates from the mean.
-the larger the standard deviation the greater the dispersion(variation) or spread within a set of data
-a low standard of deviation value reflects the data is tightly clustered around the mean =scores are similar

Question 10

strength and weakness of standard deviation

Answer 10

s-takes into account all scores = more representative of the general spread of data
w-can be affected by extreme values