Flashcards

GCSE Statistics Key concepts / words

Felix Ulrich-Oltean Statistics GCSE English 4.0Average rating 4.0 out of 5 (1 rating) 5 cards

Cards in this deck (5)

1Sampling Types?Random
Systematic
Stratified
Quota
Cluster
2Comparing two distributionsUse your ASS:
- Compare AVERAGES (use proper word, e.g. mean, median)
- Compare SPREADS (standard deviation or Inter-Quartile Range and overall range)
- Compare SKEW (positive, negative, symmetrical)
3Census vs SamplingCensus means: survey the whole population, which is EXPENSIVE, takes a LONG TIME and is DIFFICULT to deal with. But at least EVERYONE/EVERYTHING is taken into account.
Sample means: pick some people or things to represent the whole population - this is QUICKER, CHEAPER, EASIER. However, it might not be fully representative.
4Good and bad questionsA question is bad if:
- it is biased / leading,e.g. "do you agree that MathsWorld is fantastic?"
- it is open, i.e. has no response boxes
- the options overlap, e.g. 1-2, 2-3
- there is no time limitation, e.g. "how many hours of sport do you play?"
- it is vague, overcomplicated, or asks more than one thing, e.g. "How would you feel about a new shopping centre and how often do you think you'd go?"
5Cumulative FrequencyMeans RUNNING TOTAL
When drawing the graph, plot the end of each group against the frequency