Research Methods Upper Sixth- Probability Significance , Inferential Testing And Sign Tests

Question 1

What are type 1 errors

Answer 1

False positive - accepting hypothesis when it’s false (rejecting null when it’s true )

Question 2

What are type 2 errors

Answer 2

False negative - rejecting hypothesis when it’s true ( accepting null hypothesis when it’s false )

Question 3

Why do psychologists use 5 % significance level in research

Answer 3

Because it strikes as a balance between making type 1 and type 2 errors

Question 4

How do you decide which statistical test to choose ?

Answer 4

C S C
M W S
U R P

Question 5

What is unrelated and related

Answer 5

Unrelated is independent groups design
Related is - matched pairs and repeated measures design

Question 6

What is nominal data?

Answer 6

How many people in each category and ppts can only be in one category

Question 7

What is ordinal data

Answer 7

Opinion scales like 1-5
It’s subjective scales that have no set interval meanings and no proper units

Question 8

What is interval data

Answer 8

Recognised units it’s a unit of measurement that’s recognised like seconds
Objective

Question 9

What is one tailed and 2 tailed tests

Answer 9

One tailed is directional hypothesis
Two tailed is non directional hypothesis

Question 10

Describe how u would carry out sign test

Answer 10

1. Take scores of one column from the other and write + or - depending on what the answer is
2. If answer is same in both conditions then write omit and reduce sample size by 1 for each omit
3. Count how many of the less frequent sign there is
4. S=to this number and it tells u how much error in the data
5. Compare with critical value using N which is ur sample size