Statistics 2

Question 1

Measure of location

Answer 1

A singe value which describes a position in a data set

Question 2

Measure of central tendency

Answer 2

A single value that describes the position in the centre of the data set

Question 3

Mode

Answer 3

Used in qualitative/ quantitative data
Either one or two modes (bimodal)
Not very informative if no value occurs more than once

Question 4

Median

Answer 4

Used for quantitative data
Used when extreme values as it does it’s not affected

Question 5

Mean

Answer 5

Used for quantitative data
Gives a true measure of data (uses all pieces of data)
Affected by extreme values

Question 6

Finding UQ/LQ

Answer 6

Divide by 4 or multiply by 3/4 respectively
If value is
- a whole number: quartile is halfway between this data point and the one above
- not: round up and pick that data point

Question 7

Interpolation

Answer 7

Assumes data values are evenly distributed within each class

Question 8

Range

Answer 8

Difference between largest and smallest values in data set

Takes into account all data (can be affected by extreme values)

Question 9

IQR

Answer 9

Difference between UQ and LQ

Not affected by extreme values AND only considers spread of middle 50% of data

Question 10

Variance

Answer 10

Average deviation of each data point from the mean