Inferential Statistics Flashcards Preview

Psychology AQA Paper 2 > Inferential Statistics > Flashcards

Flashcards in Inferential Statistics Deck (8)
1
Q

What is probability

A

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

2
Q

What is a null hypothesis

A

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

3
Q

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

A

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

4
Q

What is a type one error

A

Rejecting a null hypothesis that is true

5
Q

What is a Type II error

A

Excepting a null hypothesis that is false

6
Q

When can parametric tests be used

A

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

7
Q

Why statistical tests used

A

To produce a calculated value

8
Q

What is needed to be known to determine the significance

A

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