Central Tendency

Question 1

Ordinal data

Answer 1

C.t = median or mode

Spread = range or inter range

Question 2

Skewed ratio or interval data

Answer 2

C.t = median or mode

Spread = inter range

Question 3

Nominal data

Answer 3

C.t = mode

Question 4

Mean

Answer 4

. (Sum)/(no of scores)
. Non skewed ratio & interval

+ powerful and most sensitive

• weird values on discrete scales
• distorted by outliers

Question 5

Median

Answer 5

For skewed ratio or interval data or ordinal data

+ unaffected by extreme scores
- can be unrepresentative of small data sets

Question 6

Mode

Answer 6

Used for skewed ratio/interval data or unusual ordinal
+ only one which can be used for categories and nominal
+ can be better for interval and ratio on a discrete scale
- not great for very small data sets

Question 7

Non skewed interval or ratio

Answer 7

C.t = mean

Spread = S.D