Data Presentation and Interpretation

Question 1

What is extrapolation?

Question 2

What is the main disadvantage of extrapolation?

Answer 2

Gives a much less reliable estimate

Question 3

What is a measure of central tendency?

Answer 3

A measure which describes the centre of the data

Question 4

When is the mode used?

Answer 4

When data is qualitative or quantitative

Question 5

When is the median used?

Answer 5

For quantitative data when there are extreme values because it is unaffected

Question 6

When is the mean used?

Answer 6

For quantitative data, however it is affected by extreme values.

• it uses all the values in the data so it gives a true measure of data

Question 7

What is a measure of spread?

Answer 7

A measure of how spread out the data is
- measures of dispersion or variation

Question 8

State the types of measures of central tendency

Answer 8

Mean
Mode
Median

Question 9

State the types of measures of spread

Answer 9

Range
Interquartile range
Interception range
Variance
Standard deviation

Question 10

State the two definitions of an outlier

Answer 10

Q3 + k(Q3 - Q1) or (IQR)
Q1 - k(Q3 - Q1)

K is generally 1.5

Question 11

What is data cleaning?

Answer 11

The process of removing anomalies from a data set

Question 12

When comparing data you should comment on…

Answer 12

• A measure of location (central tendency)
• A measure of spread

Question 13

When comparing data you can use the…

Answer 13

Mean and standard deviation
Median and interquartile range