Lecture 3

Question 1

What is a Type I error?

Answer 1

The mistake of rejecting the Ho when it is true (probability of making a Type I error = alpha)

Question 2

What is a Type II error?

Answer 2

The mistake of failing to reject the Ho when it is false (probability of making a Type II error = beta)

Question 3

How are alpha, beta and sample size mathematically related?

Answer 3

1. Fixed a, increased n will decrease b
2. Fixed n, decrease a will increase b
3. Decrease both a and b, increase n