Measures Of Central Tendency And Dispersion

Question 1

What is the mean and how do you calculate

Answer 1

Arithmetic average- total of all values that is divided by the number of values

Question 2

Strengths of mean

Answer 2

Makes use of all values
Good for interval data

Question 3

Limitations of mean

Answer 3

Its influence by extreme scores(very high or low ) so it can be unrepresentative

Question 4

What is the median

Answer 4

Arrange data from lowest to highest turbine find the middle

Question 5

Strengths of median

Answer 5

Not effected by extreme scores
Appropriate for ordinal data

Question 6

Limitations of median

Answer 6

Not as sensitive as exact values are not reflected in the final calculation

Question 7

What is the mode

Answer 7

Most common data

Question 8

Strengths of mode

Answer 8

Useful for nominal data- putting data in categories

Question 9

Limitations of mode

Answer 9

Not useful when there are several modes

Question 10

What is the range

Answer 10

Highest minus the lowest score

Question 11

Strengths of range

Answer 11

Easy to calculate

Question 12

Limitations for range

Answer 12

Affected by extreme values
Does not use all data

Question 13

What is standard deviation

Answer 13

Shows the amount of variation In a data set- assess the spread of data around the mean

Question 14

Strengths of standard deviation

Answer 14

Precise measure where all data values are taken into account

Question 15

Limitations for standard deviation

Answer 15

Difficult to calculate