Inferential Statistics

Question 1

What is the most common significance level used?

Answer 1

P 0.05

Question 2

What are type 1 and type 2 errors?

Answer 2

Type 1 - if the significance level is too high - too lenient e.g. P 0.10
Type 2 - if the significance level is too low - too strict e.g. P 0.001

Question 3

What is nominal, ordinal and interval data?

Answer 3

Nominal - data that you can pit into specific categories.
Ordinal - data that can be ordered/ranked.
Interval - data that occurs in intervals and can be timed.

Question 4

What are the 4 types of inferential tests?

Answer 4

1. Mann Whitney
2. Spearmans Rank/Rho
3. Chi-squared
4. Wilcoxon

Question 5

When is Spearmans Rank/Rho used?

Answer 5

Correlation and ordinal or interval.

Question 6

When is Chi-squared used?

Answer 6

Independent groups/matched pairs and nominal.

Question 7

When is Mann-Whitney used?

Answer 7

Independant groups/matched pairs and ordinal or interval.

Question 8

When is Wilcoxon used?

Answer 8

Repeated measures and ordinal or interval.

Question 9

In what 2 tests does the critical value have to be greater than that in the table for the result to be significant?

Answer 9

1. Spearmans

2. Chi-squared

Question 10

In what 2 tests does the critical value have to be lower than that in the table for the result to be significant?

Answer 10

1. Wilcoxon

2. Mann Whitney