5. Probability Flashcards
1
Q
What is a type one error? (Probability methods 2)
A
- Rejecting the null hypothesis, when it is actually true
- Too stringent
- e.g. 0.01
2
Q
What is a type two error? (Probability methods 2)
A
- Accepting the null hypothesis when it is actually false
- Too lenient
- e.g. 0.1 probability
3
Q
What is one way type two errors can be reduced and why does it work? (Probability methods 2)
A
- increase the sample size
- it more accurately reflects the population it was drawn from
4
Q
What is the relationship between alpha levels and confidence levels? (Probability methods 2)
A
Alpha levels + confidence levels = 1
5
Q
What are z-scores? (Probability methods 2)
A
one values relationship to the mean in a group of values
6
Q
What do z-scores allow us to do? (Probability methods 2)
A
- compare scores from different distributions
- compare scores from the same distributions
7
Q
What is standard error? (Probability methods 2)
A
A measurement of the statistical accuracy of an estimate
