The heights, $$\(h\)$$ centimetres, of a random sample of 100 fully grown animals of a certain species were measured. The results are summarised below. $$\( n=100 \quad \Sigma h=7570 \quad \Sigma h^{2}=588050 \)$$ Four random samples were taken and a $$\(99 \%\)$$ confidence interval for the population mean, $$\(\mu\)$$, was found from each sample. Find the probability that all four of these confidence intervals contain the true value of $$\(\mu\)$$. ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................
Exam No:9709_s21_qp_62 Year:2021 Question No:6(c)
Answer:
\(0.99^{4}\)
\(0.961\) (3 sf)
\(0.961\) (3 sf)
Knowledge points:
5.4.2 use formulae for probabilities for the binomial and geometric distributions, and recognise practical situations where these distributions are suitable models (Including the notations B(n,p) and Geo(p). Geo(p) denotes the distribution in which for r = 1,2,3,...)
6.4.7 determine and interpret a confidence interval for a population mean in cases where the population is normally distributed with known variance or where a large sample is used
Solution:
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