# Inferential Statistic - Methods

notes on inferential statistics with methods

a2 psychology with aqa

- Created by: Cara
- Created on: 29-06-12 13:42

First 256 words of the document:

Inferential Statistic

Inferential statistics describe a range of statistical tests designed to analyse sets of data to measure

if there actually is a significant difference (or correlation) between them

This is where the use of the terms `significant' and `chance factors' comes into the wording of

hypotheses

We can use inferential statistics on experimental, non-experimental and correlational research

Probability:

In science, probability in linked to hypothesis testing

It is the chance (or likelihood) of an observed effect (difference or correlation) being due to

chance factors

This can be expressed on a scale of 0 to 1 or as a percentage

100% or p = 1 always happens

0% or p = 0 never happens

The mean, median, mode, range and standard deviation are all descriptive statistics

Small relationships are detectable between any data sets, however:

They may be caused by chance

They may be caused by something else

Statistical tests help psychologists decide for any given sets of data which of these possibilities is

more likely

Statistical analysis

If we find that it is highly probable that the relationship was caused by chance, then we

assume it was caused by chance i.e. we accept the null hypothesis

If we find that it is highly improbable that the relationship was caused by chance, then we

assume it was caused by something else i.e. we reject the null hypothesis

This is where probability and significance levels come in.

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