GCSE Maths (Edexcel)

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Estimations from Samples

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Statistics Statistics

Estimations from Samples

6:38 Calculations From Samples
Spec S1 S5
Previous Good & Bad Samples Next Petersen Capture-Recapture Method
  • Data from a sample can be used to make estimates about a population
  • It is often easier to survey a sample than the entire population
  • Ratios are a great way of comparing two values
  • The ratio of red flowers in a population can be represented as the ratio of red flowers in a sample
  • Fractions can be created by dividing one value by another in a ratio
  • The equation frequency in population/size of population = frequency in sample/size of sample represents this concept
  • The equation can be used to make calculations and estimates about frequencies in populations
  • An example is given of estimating the number of sandwiches sold in a month based on the number sold in a day and the number of customers
  • The estimate is calculated by multiplying the number of sandwiches sold in a day by the number of customers in a month and dividing by the number of customers in a day
  • The estimate is 360 sandwiches

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