Experimental probability (Edexcel GCSE Statistics): Flashcards
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Practise the cards
10 cards from this deck
Compute experimental probability: 15 successes in 60 trials
Compute experimental probability: 15 successes in 60 trials
15/60 = 0.25 or 25%
Coin flipped 50 times: 34 heads. Experimental prob?
Coin flipped 50 times: 34 heads. Experimental prob?
34/50 = 0.68 (biased towards heads)
Find experimental probability as a fraction: 7/28
Find experimental probability as a fraction: 7/28
7/28 = 1/4 = 0.25
How does increasing the number of trials affect results?
How does increasing the number of trials affect results?
More trials reduce random variation and improve accuracy
Write the formula for experimental probability
Write the formula for experimental probability
Successful outcomes ÷ total trials
150 flips: heads=82. Find prob and compare to 0.5
150 flips: heads=82. Find prob and compare to 0.5
82/150 ≈ 0.547; slightly above 0.5, small bias
Find experimental probability: 34 heads of 50 flips
Find experimental probability: 34 heads of 50 flips
34/50 = 0.68 = 68%
Which estimate more reliable: 60 trials or 150?
Which estimate more reliable: 60 trials or 150?
150 trials more reliable; larger sample reduces error
Calculate experimental prob: 34 heads from 50 flips
Calculate experimental prob: 34 heads from 50 flips
0.68 (34/50)
Spinner 200 spins: D=79. Find expected and bias?
Spinner 200 spins: D=79. Find expected and bias?
Expected 50. Experimental prob 79/200 = 0.395. Biased to D.