CAIE S2 2018 November — Question 1

Exam BoardCAIE
ModuleS2 (Statistics 2)
Year2018
SessionNovember
TopicLinear combinations of normal random variables
TypeKnown variance confidence interval
1 The standard deviation of the heights of adult males is 7.2 cm . The mean height of a sample of 200 adult males is found to be 176 cm .
  1. Calculate a \(97.5 \%\) confidence interval for the mean height of adult males.
  2. State a necessary condition for the calculation in part (i) to be valid.
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