Answered: Ear infections A new vaccine was…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Ear infections A new vaccine was recently tested to see
if it could prevent the painful and recurrent ear infections
that many infants suffer from. The Lancet, a medical
journal, reported a study in which babies about a year
old were randomly divided into two groups. One group

received vaccinations; the other did not. During the fol-
lowing year, only 333 of 2455 vaccinated children had

ear infections, compared to 499 of 2452 unvaccinated
children in the control group.a) Are the conditions for inference satisfied?
b) Find a 95% confidence interval for the difference in
rates of ear infection.
c) Use your confidence interval to explain whether you
think the vaccine is effective.

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