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Statistical inference

2 dot points across 2 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How does the capture-recapture method estimate the size of a population you cannot count directly?

The Petersen capture-recapture formula to estimate a population size; the assumptions the method relies on and their appropriateness; the role of sample size in the reliability of the estimate.
A focused answer to Edexcel GCSE Statistics (Higher tier) on the capture-recapture method, covering the Petersen formula to estimate a population size, the assumptions it relies on and their appropriateness, and how sample size affects the reliability of the estimate.
9 min answer →

How do you use a sample to estimate features of the whole population?

Using summary statistics to estimate population characteristics; estimating the population mean from a sample; predicting population proportions; the effect of sample size on reliability and replication.
A focused answer to Edexcel GCSE Statistics on statistical inference, covering using summary statistics to estimate population characteristics, estimating the population mean from a sample, predicting population proportions, and how sample size affects reliability and replication.
9 min answer →