OnlineMedEd: Epidemiology and Stats - "Hypothesis Testing"

Question 1

“Group 1 is the same as group 2” is referred to as the __________ hypothesis.

Answer 1

null (also called Ho)

Question 2

“Group 1 is not the same as group 2” is referred to as the ___________ hypothesis.

Answer 2

alternate (Ha)

Question 3

When P is ________ than alpha, we reject the null hypothesis.

Answer 3

less

Alpha is the level of significance (usually given as 0.05).

Question 4

Describe a type I error.

Answer 4

A type I error is when you reject the null hypothesis when it is actually true –meaning you think there’s a difference when there’s not.

Remember it this way: 0.05 is the usual alpha. If you reject the null hypothesis it means that the P should be greater than 0.05 but it’s not. Alpha = One error.

Question 5

Power is ___________.

Answer 5

1-Beta

Beta decreases with increased sample size, thus power increases with increased sample size.