Flashcards in Measurement and data reliability Deck (10):
What are the 3 types of errors that affect the validity of analytical measurement?
Indeterminate (random error)
Determinate (systematic error)
Gross error - big mistake
Random error affects precision more than accuracy. True or false?
Systematic error affects accuracy more than precision. True or false?
What is meant be precision?
How close two values are to each other
What is meant by accuracy?
How close value is to the true value
Standard deviation gives an idea about how far results are spread from a mean value. True or false?
What are the origins of systematic error?
Null hypothesis assumes no bias. True or false?
What is the t-test used for?
To calculate confidence intervals of a measurement when the population SD is not known - usually when there is a limited number of data points