102,927 women were recruited between 2003-2013 for a study on breastcancer and smoking status. On recruitment, the women were asked ifthey had ever smoked regularly (most days for at least 6 months).Their breast cancer status was determined at the end of the study.Table 1Smoking status Breast cancerYes NoTotal36791660131815 100989 102804Ever smoked742 36049Never Smoked 1073 64940Total(a) State whether this is a cohort or case-control study, and give areason for your answer.(b) Why is the total of the participants in Table 1 not 102,927?(c) Calculate the relative risk of breast cancer for participants whohad ever smoked compared to those who had not.(d) Obtain a 95% confidence interval for the relative risk.(e) Interpret your results.

The cohort study starts with the putative cause of disease and observes the occurrence of disease…

Answered: (a) State whether this is a cohort or…

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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QUESTION 1 a) Two machines are used to fill glass bottles with a net volume of 13.0ml. The filling processes are assumed to be normally distributed, with common but unknown standard deviations. The quality department suspects that both machines fill to the same net volume, whether or not this volume is 13.0ml. An experiment is performed by taking a random sample from the output of each machine. 13.01 12.98 13.02 13.05 12.99 Machine 1 13.03 13.01 12.96 12.97 13.04 13.04 13.02 13.01 13.05 13.02 Machine 2 13.00 12.96 12.99 13.02 13.03
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