Statistical Issues Of Design

Question 0

Type 2 Error

Answer 0

We do not reject the null
Null is false in the population

Probability = beta

Question 1

Type 1 Error

Answer 1

We reject the null
Null is true in the population

Probability = alpha (.05)

Question 2

We reject the null

The null is true in the population

Answer 2

Type 1 Error

Question 3

We reject the null

The null is false in the population

Answer 3

Correct decision!

Question 4

We fail to reject the null

The null is true

Answer 4

Correct Decision!

Question 5

We fail to reject the null

The null is false in the population

Answer 5

Type 2 Error

Question 6

The theory about decision errors

Answer 6

Fisher’s Classical Statistical Decision Theory

Question 7

Factors the Affect Beta

Answer 7

Sample size
Alpha
Difference between means
variability of DV

Question 8

Sample size

Answer 8

Sample size increases, beta decreases
Experimenter
Cost is a constraint
Solution is to test as many subjects as possible

Question 9

Alpha

Answer 9

Alpha goes up, beta goes down
Experimenter’s fault
Tradition is a constraint
Solution is to make alpha .05

Question 10

Difference between means

Answer 10

Difference increases, beta decreases
Nature’s fault
Relation of IV and DV are at fault
Choose your levels wisely

Question 11

Variability of DV

Answer 11

Variability goes up, beta decreases
Nature’s fault
Due to participant homogeneity
Reduce variability of other factors