For each problem, a) find the difference between the two sample proportions. b) use Confidence Interval for the Difference in Proportions Calculator - Statology to find a 90%, 95%, and 99% confidence interval for true difference between the two proportions. c) Determine whether zero is a possible difference or not. If so, zero is in which confidence level? Problem 1: 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 following year, only 333 of 2455 vaccinated children had ear infections, compared to 499 of 2452 unvaccinated children in the control group.

For each problem, a) find the difference between the two sample proportions. b) use Confidence Interval for the Difference in Proportions Calculator - Statology to find a 90%, 95%, and 99% confidence interval for true difference between the two proportions. c) Determine whether zero is a possible difference or not. If so, zero is in which confidence level? Problem 1: 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 following year, only 333 of 2455 vaccinated children had ear infections, compared to 499 of 2452 unvaccinated children in the control group.

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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