3.2a Experimentation and pilot studies

Question 1

What is the definition of validity?

Answer 1

variables controlled so that any measured effect is likely to be due to the independent variable

Question 2

What is the definition of reliability?

Answer 2

consistent values in repeats and independent replicates

Question 3

What is the definition of accuracy?

Answer 3

data, or means of data sets, are close to the true value

Question 4

What is the definition of precision?

Answer 4

measured values are close to each other

Question 5

What is an independent replicate?

Answer 5

the experiment being repeated by people that were not part of the original experiment

Question 6

What is a pilot study used for?

Answer 6

• it is integral to the development of an investigation
• used to help:
• plan procedures
• asses validity
• check techniques

Question 7

What are the benefits of carrying out a pilot study?

Answer 7

• allows evaluation and modification of experimental design
• can ensure an appropriate range of values for the independent variable
• be able to establish the number of repeat measurements required to give a representative value for each independent datum point