SOLUTION: A federal
report stated that 88% of children under age 18 were
covered by health insurance in 2000. How large a
sample is needed to estimate the true proportion of
covered chil
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-> SOLUTION: A federal
report stated that 88% of children under age 18 were
covered by health insurance in 2000. How large a
sample is needed to estimate the true proportion of
covered chil
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Question 491599: A federal
report stated that 88% of children under age 18 were
covered by health insurance in 2000. How large a
sample is needed to estimate the true proportion of
covered children with 90% confidence with a
confidence interval 0.05 wide?
You can put this solution on YOUR website! A federal
report stated that 88% of children under age 18 were
covered by health insurance in 2000. How large a
sample is needed to estimate the true proportion of
covered children with 90% confidence with a
confidence interval 0.05 wide?
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If the CI is 0.05 wide
2E = 0.05
E = 0.025
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Since E = z*sqrt(pq/n)
sqrt(n) = [z/E]*sqrt(pq)
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So, n = [z/E]^2*pq
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n = [1.645/0.025]^2*0.18*0.72
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n = 562 when rounded up
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Cheers,
Stan H.
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