module 1 Flashcards
what does accuracy mean?
little difference between your results and other scientists.
what does precision mean?
how close the recorded results are to one another
what does repeatable mean?
if you repeat the experiment and get the same result
what does reproducible mean?
someone else follows the same method and gets the same results
how do you increase reliability?
repeat experiment. The more repeats that match, the more reliable
how do you increase validity?
control variables
how do you improve precision?
use equipment of smaller degree
how do you improve accuracy?
-repeat and calculate mean
-eliminate errors e.g human error by using computer
-ensure all equipment is calibrated
how do you calculate d.f for chi squared?
n-1
how do you calculate d.f for unpaired t-tests?
sum of both samples (n) - number of data sets
how do you calculate degrees of freedom for paired t-tests?
n-1
how do you calibrate an eyepiece graticule?
-Line up the two scales (the stage and eyepiece graticules)
-Count the number of divisions on the eyepiece graticule equivalent to each division on the stage micrometre.
-As the length equivalent to each division on the stage micrometer are known, calculate the length of one eyepiece division.
what type of t-test does OCR only teach?
unpaired t-test
how do you confirm an anomaly?
repeat the experiment
