Redeatch Methods - Maths Skills

Question 1

Percentage increase equation

Answer 1

100 x (final-initial)/initial

Question 2

Percentage decrease equation

Answer 2

-100x (final-initial)/initial

Question 3

How to covert a percentage to a decimal

Answer 3

Remove percentage sign

Move decimal places two places to the left

Question 4

Explain part to whole ratio

Answer 4

The relationship between a particular group and the whole population eg ratio of blue eyes in class to everyone in the class

Question 5

Explain part to part ratios

Answer 5

The relationship between two distinct groups - ratio of blue eyes in the class to Brown eyes

Question 6

What does < mean

Answer 6

Less than (strict inequality)

Question 7

What does > mean ?

Answer 7

Greater than (strict inequality)

Question 8

What does&raquo_space; and &laquo_space;mean ?

Answer 8

Much greater than and much less than

Question 9

What is the accepted level of probability in psychology

Answer 9

5% so p=0.05
This means that 95% probability that the results were due to change in the IV and 5% probability that the results of a study occur by fluke

Question 10

What do significant figures start from

Answer 10

First non zero number

Question 11

What differences in size described as

Answer 11

Differences in order of magnitude

This is difference calculated in factors of 10

Question 12

If you increase a number by one order of magnitude

Answer 12

Multiplying the number by 10

Question 13

If you decrease a number by one order of magnitude what happens ?

Answer 13

You are dividing by 10 - equivalent to multiplying by 0.1