# 2.5.2 Descriptive statistics Flashcards

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1
Q

how do you calculate the mean?

A

adding all the values and dividing by the no. of values

2
Q

what is a strength of using the mean?

A

most powerful measure of central tendancy - uses all data

3
Q

what is a weakness of using the mean?

A

skewed easily by extreme values

4
Q

what is it important to check for with the mean?

A

extreme values

5
Q

what is the median?

A

the middle value when data is ranked in order

6
Q

what are strengths of using the median?

A

not affected by extreme scores

easy and quick

7
Q

what are weaknesses of using the median?

A

less powerful - doesn’t use all data

8
Q

what is the mode?

A

most occurring value

9
Q

what does bimodal mean?

A

more than one mode

10
Q

what are strengths of the mode?

A

easiest to calculate
not affected by extreme values

11
Q

what are weaknesses of the mode?

A

least powerful

not always possible to use

12
Q

what is the range?

A

subtract smallest value from biggest

13
Q

what is a strength of the range?

A

easy to calculate

14
Q

what is a weakness of the range?

A

affected by extreme values

15
Q

what is standard deviation?

A

measure of dispersion

tells us how spread out the scores are around the mean

16
Q

what is a strength of standard deviation?

A

most sensitive measure of dispersion using all values