Lesson 14: Descriptive Statistics

Question 1

What are the measures of central tendency?

Answer 1

Mean
Median
Mode

Question 2

What is the mean?

Answer 2

calculated by adding all the scores together and dividing it by the number of total scores

Question 3

Advantage of mean

Answer 3

Most accurate measure as it takes into account ALL the scores

Question 4

Disadvantage of mean

Answer 4

can be distored by a single EXTREME value in the set

Question 5

What is the median

Answer 5

Ranking all the scores in order and taking the middle value

Question 6

Advantage of median

Answer 6

UNAFFECTED by EXTREME scores

Question 7

Disadvanatge of median

Answer 7

unrepresentative of data as not all scores are taken into account, data is not as sensitive as the MEAN

Question 8

Mode?

Answer 8

most frequent value within the set

Question 9

Advantage of the mode?

Answer 9

Mode is unaffected by extreme scores

Question 10

Disadvantage of the mode?

Answer 10

tells us nothing about other scores in a data set

Question 11

What are the TWO measures of dispersion?

Answer 11

Standard deviation
Range

Question 12

What is the range?

Answer 12

Highest number in the set- Lowest number in the set (ADD 1)
e.g 1,2,3,4,5,6

6-1=5 (+1)

range =6

Question 13

Advantage of range?

Answer 13

quick and easier to calculate in comparison to standard deviation

Question 14

disadvantage of range?

Answer 14

can easily be distorted by extreme values

Question 15

What is standard deviation?

Answer 15

the AVERAGE amount that each score DIFFERS from the MEAN

Question 16

Advantage of standard deviation?

Answer 16

Takes into account all the scores

Question 17

Disadvantage of standard deviation?

Answer 17

more difficult to calculate than the range, can only be used on INTERVAL data