ISA- section 2

ISA- section 2

1. Key words

   • precision- when the measurements are ALL close to the mean value-no relation to true value
   • resolution- the smallest change in the quantity being measured
   • accuracy- how close something is to the true value
   • Random errors- errors caused by things we cant control
   • systematic errors- errors caused by faulty equipment
   • reliable- a result that constantly stays the same after several repeats
   • repeatable- if the original experimenter with same equipment gets the same results
   • reproducible- if another person with different equipment or techniques gets the same results
   • independent variable- the one your changing
   • dependent variable- the one your measuring
   • a fair test- when only the independent variable has been allowed to affect the dependent variable
   • validity- your results are only valid if you have carried out a fair test
   • control variable- the ones you keep the same
   • continuous variable- can have any numerical value
   • categoric variable- are described in labels

2. comparing results with other people

   • similar pattern
   • if the same pattern or trend accurs the results are reproducible
   • check results
   • anomalies
   • variables

3. hypothesis

   • does the hypothesis support the results?
   • what does the results look like
   • pattern?
   • EXAMPLES

4. Errors

   • what went wrong?
   • how could you make it better?
   • measuring cylinder
   • zero error
   • systematic error (environment)
   • human error
   • more repeats

5. anomalous results

   • doesn't fit the pattern
   • label it
   • say why its an AR
   • Exampes

6. case studies

   • mention all case studies
   • give examples
   • pattern