How SMALL a measurement is to be precise.
e.g mm more precise than cm because more units to measure to a degree of accuracy- because smalller.
how close a measurement is to TRUE VALUE
if repeated results will be the same
repeat measurements check reliability of results
ONLY INDEPENDENT variable effects the DEPENDENT V.
ONLY CHANGE Independent variable keep everything else SAME
GRAPHS + TABLES
Tables = I.D first column independent variable ... second column Dependent variable
Graphs- how to plot
S cale - in 10s 2s?....
L ine - best fit? curve? not joint?
A xes- x = Independent v y= Dependent
P lot - how accurate its done so make sure you read the table of results carfully and
covered all of the results on the graph unless told otherwise
Things kept same = fair test
VALIDITY / VALID
results need to be valid to get conclusions - remove anomolies + repeat
REsults can be VALID by conducting a FAIR TEST
Practical experiment LAYOUT
C ompare - 50cm 10 cm etc INDEPENDENT VARIABLE
O ganisim - human? lady bug?.... same gender height weight
R peat- repeat to make accurate
M asure/ method
S me - what you will keep the same to make fair test!