Describitive Data

Question 1

What is measures of central tendency

Answer 1

Provides a single value that represents a set of data by indicating the most typical value

Question 2

3 types of central tendency

Answer 2

• the mode
• the medium
• the mode

Question 3

The mode A01 + A03

Answer 3

• value in a set of scores that occurs most frequent

Nominal data

Strengths
- unaffected by extreme scores
- always an actual score

Weaknesses
- my not be a single modal value
- no info about other scores

Question 4

The medium AO1 + AO3

Answer 4

Middle value of a set of scores that has be placed in order

Ordinal data

Strengths
- unaffected by extreme scores
- used with data from skewed distributions

Question 5

The mean AO1 + AO3

Answer 5

Arithmetic average of a set of score
Calculated: adding all value dividing by total number

Strengths
- uses all values of all the scores so is the most powerful measure

Interval data

Weaknesses
- may not be an actual score =may not be meaningful
- extreme values can affect = normal distributions

Question 6

What is measures of dispersion

Answer 6

Measures invite variability within a set of data

Question 7

2 types of measures of dispersions

Answer 7

The range and standard deviation

Question 8

The range AO1 + AO3

Answer 8

The range is the differences between the highest and the lowest scores

Strengths
- simple and quick to calculate

Weaknesses
- not provide info about how scores are spread out around the centre
- ones t take all values into account
- affected by extreme values

Question 9

Standard deviation

Answer 9

Measures of the spread of scores around the mean
- larger the SD the grater the spread of scores around the mean
Smaller number = similar to mean = more meaningful data

Strengths
- most precise measurement of dispersion
- includes all values

Weaknesses
- distorted by a single extreme value