9 - Statistics Flashcards
1
Q
What’s the equation used to find the unbiased estimate of the population variance?
A
2
Q
When is a “Z” test used?
A
When the population variance is KNOWN
3
Q
When is a “T” test used?
A
When the population variance has been ESTIMATED from the sample
4
Q
What is the underlying assumption of both Z and T tests?
A
The population distribution is normal
5
Q
Within confidence interval _________ H0
A
Within confidence interval ACCEPT H0
6
Q
Outside of confidence interval _________ H0
A
Outside confidence interval REJECT H0
7
Q
What is a type 1 error?
A
Reject H0 when it was TRUE
8
Q
How do you calculate the probability of a type 1 error occurring?
A
9
Q
What is a type 2 error?
A
Fail to reject H0 when it was FALSE
