Stats Tests

Question 1

What are degrees of freedom and how do you find them for a chi-squared test?

Answer 1

The number of values that are free to vary given that the overall total values are known

Calculation: (rows - 1) x (columns - 1) in your contingency table

Question 2

What is the mnemonic to see if chi-squared test is appropriate?

Answer 2

C - hi-squared
A - ssociation
N - ominal data
D - ifference
I - ndependent groups design

Question 3

What are the 3 levels of measurement?

Answer 3

Nominal data
Ordinal data
Interval data

Question 4

What is nominal data?

Answer 4

Data that is classified into distinct categories without any order or ranking and can be recorded in terms of frequencies. Each piece of data can only fit into one category

Question 5

What is ordinal data?

Answer 5

Data that can be placed in a specific order or rank, but the intervals between the data points aren’t necessarily equal e.g a scale from 1-10

Question 6

What is important to remember to identify the right level of measurement?

Answer 6

Focus on what is being measured, ignore any other noise

Question 7

What is interval data?

Answer 7

Data that can be measured using fixed units of equal intervals and an extension to ordinal data