Flashcards in Inferential testing Deck (12):

1

## What is probability?

### The likelihood of events being determined by chance

2

## Why do psychologists use a 5% level of significance in research?

### It strikes a balance between the risk of making the Type I and II errors

3

## What is a type I error?

### Reject null when it is true and accept alternative (false positive)

4

## What is a type II error?

### Accept null when it is false and reject when it alternative is true (false negative)

5

## What is inferential testing?

### Statistical procedures that make predictions about populations from mathematical analysis of data taken from samples

6

## What is the rhyme you use to remember nominal data?

###
Naughty Children Swear Constantly

Nominal: Chi-squared, Sign test, Chi-squared

7

## What is the rhyme you use to remember ordinal data?

###
Only Men Want Sausages

Ordinal: Mann-Whitney, Wilcoxon, Spearman

8

## What is the rhyme you use to remember interval data testing?

###
I Usually Rate Pizza

Interval: Unrelated t-test, related t-test, Pearsons

9

## What are the two other names for a type I error?

###
- Error of optimism

- False positive

10

## What are the two other names for a type II error?

###
- Error of pessimism

- False negative

11

## Why would researchers use a one-tailed test?

### They have previous knowledge indicating results, meaning they have a directional hypothesis

12