OCR S3 2013 June — Question 2

Exam BoardOCR
ModuleS3 (Statistics 3)
Year2013
SessionJune
TopicCentral limit theorem
TypeProportion confidence interval

2 In order to estimate the total number of rabbits in a certain region, a random sample of 500 rabbits is captured, marked and released. After two days a random sample of 250 rabbits is captured and 24 are found to be marked. It may be assumed that there is no change in the population during the two days.
  1. Estimate the total number of rabbits in the region.
  2. Calculate an approximate \(95 \%\) confidence interval for the population proportion of marked rabbits.
  3. Using your answer to part (ii), estimate a 95\% confidence interval for the total number of rabbits in the region.