research method unit 4

level of significance

5%

• there is a 95% confidence that there is a significant finding, only 5% probability that results are due to chance

1% level of significance

used if research is socially sensitive - better to be cautious and make type 2 error - type 1 could damage society e.g. more sex offenders than rly is

5% level of significance

strikes balance between probability of type 1 and 2 error

type I error

• false positive

• rejected null when should have accepted

• more likely at 10% level of significance

• e.g. old man pregant

type II

• false negative

• accepted null when should have accepted

• more likely at 1% level of significance

choosing stats test table

related unrelated correlation

nominal Bi-nominal. chi squared. chi squared

ordinal wilcoxon. mann-whitney. spearmans

interval R TT. UTT Pearsons

3 Ds

Difference or relationship

Data

Design

working out CV

1. is it one or two tailed

2. what level of significance is used

3. what is N or df

4. which direction is calculated compared to critical

12 marker

point - state the feature

example - how to do it - link to study

explain- justify why u have made the choice (cost vs benefit)