L11 - Inference Analysis: Non-parametric Tests

Question 1

What are the Non-Parametric Test (all but Under Roast Potatoes)

Answer 1

• Chi-squared
• Sign
• Mann Whitney U
• Wilcoxon
• Spearman’s Rho

Question 2

For Spearman’s Rho, what does ‘N’ and ‘d’ stand for?

Answer 2

N- No. of Participants

d - Difference between ranks

Question 3

For Mann Whitney, what do ‘Na’, ‘Nb’ and ‘T’ stand for?

Answer 3

Na - No. of participants in the smaller sample
Nb - No. of participants in the larger sample
T - Sum of ranks in the smaller sample

Question 4

For Chi-Squared, what does observed value mean?

Answer 4

The numerical value calculated by the statistical tests.

Known as calculated value and is compared to the critical value to check significance

Question 5

What are degrees of freedom?

Answer 5

The number of values that are free to vary

Question 6

For Wilcoxon, what should you do?

Answer 6

• Work out the sum of positive ranks

- Work out sum of negative ranks

Question 7

For Wilcoxon, what do ‘T’ and ‘N’ stand for

Answer 7

T - The smaller value

N - No. of participants who scored differently in both conditions

Question 8

What is a good template when considering significance?

Answer 8

Yes it is significant, as x is greater than/less than y at p<a></a>