Click a card to flip it and reveal the answer.
Task cards — solve, then click to check.
R1 spot the issue • R2 random vs systematic • R3 % error. Solve, then click to check.
R1a
Lab group A repeats a mass: 9.95, 10.05, 10.02 g (true 10.00) — issue?
ANSWER
PRECISION fine, ACCURACY fine — tight + centered, both good
R1b
Each trial reads 10.55 g — true value 10.00 g — issue?
ANSWER
ACCURACY problem — all 0.55 high, systematic bias
R1c
Reader misreads the meniscus — true value 10.00 g — issue?
ANSWER
Both can suffer — method / reading-technique error
R2a
Scattered readings, no bias — random or systematic?
ANSWER
RANDOM — scatter with no constant shift
R2b
All readings shift +0.15 g — random or systematic?
ANSWER
SYSTEMATIC — constant +0.15 bias
R2c
Bad calibration: every trial 0.05 low — random or systematic?
ANSWER
SYSTEMATIC — constant low offset (calibration)
R3a
Measured 10.15 g, accepted 10.00 g — % error?
ANSWER
% error = (10.15−10.00)/10.00 × 100 = 1.5%
R3b
Measured 2.55 L, accepted 2.50 L — % error?
ANSWER
% error = (2.55−2.50)/2.50 × 100 = 2.0%
R3c
Measured 4.02 s, accepted 4.00 s — % error?
ANSWER
% error = (4.02−4.00)/4.00 × 100 = 0.5%
R3d
Measured 7.5 g, accepted 7.5 g — % error?
ANSWER
% error = 0% — perfect match