Inferential Statistics

Question 1

What is probability

Answer 1

A numerical measure of the likelihood or chance that certain events will occur

Question 2

What is a null hypothesis

Answer 2

A statement of no relationship. How probable is the research result if there is actually nothing going on

Question 3

What do you psychologist use to assess if the result is due to chance or real affect

Answer 3

Psychologists use the 95% level: P equals 0.05 mins 5% possibility that result is due to chance, 95% possibility that it is a real effect
In research concerning e.g. life and death matters, probability level is 0.01

Question 4

What is a type one error

Answer 4

Rejecting a null hypothesis that is true

Question 5

What is a Type II error

Answer 5

Excepting a null hypothesis that is false

Question 6

When can parametric tests be used

Answer 6

With an interval or ratio level of measurement
Be drawn from population with normal distribution
Both samples have equal variances

Question 7

Why statistical tests used

Answer 7

To produce a calculated value

Question 8

What is needed to be known to determine the significance

Answer 8

The significance level usually p equals 0.05
One or two tailed test
Value of N or df