EBK WHAT IS LIFE? A GUIDE TO BIOLOGY WI
5th Edition
ISBN: 9781319360689
Author: PHELAN
Publisher: VST
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Chapter 1, Problem 8SA
Summary Introduction
To analyze:
Ways in which the given study design could be improved.
Introduction:
Bringing in standardization in the treatment and variables in the experiment could make it more robust.
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A researcher assessed body weight in a community using two methods. First, participants were asked, “Do you think you are overweight?” (Possible answers: ‘yes’ or ‘no’). All participants were then weighed and classified as ‘overweight’ or not. The assessment was however done separately by hypertensive status. Among 270 hypertensive participants, 108 were classified as overweight on the basis of being weighed. Of these 108, 54 reported themselves as overweight when questioned. Of the 162 participants not classified as overweight on the basis of being weighed 16 reported themselves as overweight when questioned. Among 745 non-hypertensive participants, 134 were classified as overweight on the basis of being weighed. Of these 134, 118 reported themselves as overweight when questioned. Of the 611 participants who were not classified as overweight on being weighed, 110 reported themselves as overweight on questioning.
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A study is done to examine whether there is an association between the daily use of vitamins C & E and risk of coronary artery disease (heart attacks) over a 10 year period. When subjects who took both vitamins were compared to those who took not vitamins at all, the risk ratio was found to be 0.70. Which of the following is a correct interpretation of this finding? Answer and explain.
a. The incidence of coronary artery disease in those who take vitamins C & E daily is 0.70 (or 70%)
b. Those who take vitamins C & E daily have 0.7 times the risk of heart attack compared to those who do not take vitamins
c.The risk difference in this study is 70 per 100 vitamin users over ten years
d. The odds ratio in this study is 70 per 100 vitamin users over ten years
e. The risk difference in this study is 0.70 per 100 vitamin users over ten years
You have 300 calves that currently weigh 580 lb and you would like to feed them until they are 850 lb, then market them to a feedlot. Your goal for the steers’ ADG is 3.0 lb/day. Feeds available are listed in the table below.
1. Use Table to determine the TDN and CP concentrations required in the diet to meet requirements
Average bodyweight Average daily gain TDN(%) CP (%)325 kg 1.30 kg/day 80 12325 kg 1.36 kg/day 85 16325 kg 1.40 kg/day 90 20
2. Formulate a diet using the Multiple Feed Method to meet the steers’ requirements for TDN and CP.Feedstuff DM % TDN (% of DM) CP (% of DM)Brome hay 91 56 9Corn grain 89 96 9Supplement 91 96 31.
Chapter 1 Solutions
EBK WHAT IS LIFE? A GUIDE TO BIOLOGY WI
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Ch. 1 - Prob. 11SACh. 1 - Prob. 12SACh. 1 - Prob. 13SACh. 1 - Prob. 14SACh. 1 - Prob. 15SACh. 1 - Prob. 16SACh. 1 - Prob. 17SACh. 1 - Prob. 1MCCh. 1 - Prob. 2MCCh. 1 - Prob. 3MCCh. 1 - Prob. 4MCCh. 1 - Prob. 5MCCh. 1 - Prob. 6MCCh. 1 - Prob. 7MCCh. 1 - Prob. 8MCCh. 1 - Prob. 9MCCh. 1 - Prob. 10MCCh. 1 - Prob. 11MC
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