Type - i and Type ii error Flashcards
1
Q
What is Type One I error
A
- Null is true but rejected
- False Positives
- significance threshold Alpha = 0.05
2
Q
Type two II error
A
- Alternate is true but is rejected
- False Negatives
- Statistical power set at Beta = 0.20
- Statistical power = 1-B = 80%
3
Q
What effects the sample size calculations in your study?
A
- Study design
- Statistical significance threshold Alpha
- Statistical Power Beta
- Expected effect size
4
Q
When your effect size is larger is the sample size required smaller or large?
A
When the expected effect size is bigger, a smaller sample size is
needed.
5
Q
Which study has a limited sample size?
A
Historical cohort, case-control
6
Q
When do you get a power problem?
A
Limited sample size case-control and historical cohort studies has a power problem are underpowered increase the risk of type II error as well as type I error.
