AWABS - Statistics

Question 1

Types of data

Answer 1

Question 2

Example of ordinal qualitative data

Answer 2

Mild, Moderate, Severe
ASA I - VI

Question 3

Histogram vs bar chart

Answer 3

Histogram represents continuous data and bars touch each other

Bar charts are for qualitative data and have gap between bars

Question 4

Methods of summarising ‘spread’ of data

Answer 4

Range
Interquartile range
Standard deviation / variance

Question 5

Skew definition

Answer 5

Small tail dictates direction of skew

Tip:
Mean, median and mode move towards the skew in Alphabetical order!

Question 6

Standard deviation vs Standard error

Answer 6

Standard deviation tells you about the spread of your data

Standard error tells you about the accuracy of your mean

Question 7

How tests work - Null hypothesis method

Answer 7

Can be summarised by “GOSH” acronym:
Groups
Outcome
Summarise
Hypothesis test

Question 8

P value definition

Answer 8

The probability of obtaining a particular statistical result (or a more extreme statistical result) assuming that the null hypothesis is true

Eg if P = 0.05, if null hypothesis were true I would expect to obtain this result 5% of the time

Question 9

Statistical test cheat sheet to pick a test depending on data set qualities

Answer 9