stat hw

stat hw - Homework 2 1a) The treatment is the vaccination...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Homework 2 1a) The treatment is the vaccination program. The response variables are death or no death. This is an observational study. 1b) The suspension of the vaccination program is not a wise decision. A stronger experimental design would be having one control group and one treated group for the infirm and for elderly. The control group would think they have been vaccinated-putting into place the placebo effect and the treated group will be the ones who actually receive the vaccine. Through this experimental design the deaths can be determined whether it is due to the vaccine or perhaps due to other causes. To prevent PCF, it is optimal to split the subject equally between control (not knowing they actually have had not had the vaccine) and treated groups (ones who actually got the vaccine). 2a) If teachers had not been asked to intervene in the assignment, the experiment would have been a controlled experiment. This is because the experiment is limited to one variable- having milk (treatment) or no milk (control). Since the teachers did intervene this is an observational study-bias arising from PCF. The teachers used their own judgment, bias, when wanting to switch children between treatment and control. The teacher’s judgment was based on the child’s background and health status.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/17/2012 for the course AMS 107 taught by Professor Brummell,n during the Summer '08 term at UCSC.

Page1 / 3

stat hw - Homework 2 1a) The treatment is the vaccination...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online