Measurement and data reliability

Question 1

What are the 3 types of errors that affect the validity of analytical measurement?

Answer 1

Indeterminate (random error)
Determinate (systematic error)
Gross error - big mistake

Question 2

Random error affects precision more than accuracy. True or false?

Answer 2

True

Question 3

Systematic error affects accuracy more than precision. True or false?

Answer 3

True

Question 4

What is meant be precision?

Answer 4

How close two values are to each other

Question 5

What is meant by accuracy?

Answer 5

How close value is to the true value

Question 6

Standard deviation gives an idea about how far results are spread from a mean value. True or false?

Answer 6

True

Question 7

What are the origins of systematic error?

Answer 7

Instrumental
Personal error
Method

Question 8

Null hypothesis assumes no bias. True or false?

Answer 8

True

Question 9

What is the t-test used for?

Answer 9

To calculate confidence intervals of a measurement when the population SD is not known - usually when there is a limited number of data points

Question 10

Biological essays are difficult to validate so should be left alone as they are in BP. True or false?

Answer 10

True