# Final - Theory Flashcards

Unbiased : E(θ) = ?

0

Biased : E(θ) = ?

Not 0

What is the variance of a precise measurement?

Small variance

What is the variance of an unprecise measurement?

High variance

How does an increase in n affect the confidence interval?

Decreases

How does a decrease in variance affect the confidence interval?

Increases

Define the null hypothesis.

Absence of difference or a treatment effect

What is alpha?

The chance of an error that you are willing to accept

What is a type I error?

Rejecting a true null hypothesis

What is the power of the test?

The probability to reject a false null hypothesis

What is a type II error?

Accepting a false hypothesis

What are the outcomes in terms of the power of the test and the type II error if there is a small difference between u and u0?

- High type II error

- Low power of the test

What are the outcomes in terms of the power of the test and the type II error if there is a large difference between u and u0?

- Low type II error

- High power of the test

What are the outcomes in terms of the power of the test if alpha is low?

Low power of the test

What are the outcomes in terms of the power of the test if alpha is high?

High power of the test