An article describes several studies of the failure rate of defibrillators used in the treatment of heart problems. In one study conducted by the Mayo Clinic, it was reported that failures were experienced within the first 2 years by 15 of 81 patients under 50 years old and 19 of 356 patients ages 50 and older who received a particular type of defibrillator. Assume it is reasonable to regard these two samples as representative of patients in the two age groups who receive this type of defibrillator. (c) Suppose that the researchers wanted to estimate the proportion of patients under 50 years old who experience a failure within the first 2 years after receiving this type of defibrillator to within 0.03 with 95% confidence. How large a sample should be used? Use the results of the study as a preliminary estimate of the population proportion. (Round your answer up to the nearest whole number.)[Input Box] patients

Givenx=19n=356Margin of error(E)=0.03p^=xn=19356=0.0534Confidence interval = 95%α=1-0.95=0.05α2=0.025zα2=z0.025=1.96 (from standard normal table)sample size(n)=(zα2E)2×p^×(1-p^)n=(1.960.03)2×0.0534×(1-0.0534)n=215.8n≅216 patients

Answered: (c) Suppose that the researchers wanted…

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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