November 6, 2015
Week 6 Written Assignment - Performing Hypothesis Tests on Two Samples
Number 6 and 7
Ha: pl will not accept p2
Sample proportion pl =xl/nl=0.6333
Sample proportion p2=x2/n2=0.825
Match the following individuals with their contributions to the field of epidemiology.
Hypothesized that disease might be associated with the
physical environment; distinguised between epidemic and
Credited with "mode
Week One Lecture Presentation
By Damien Byas, Ph.D.
In this lecture we will discuss:
Types of Study Variables
TYPES OF STUDY VARIABLES
Numeric Variables (quantitative): Represents the type of
MPH 604 Week 6 Calculations- Tamela Isabel
Relative Risk/Rate Ratio
Show all your work for the best possible evaluation of your responses.
1. A prospective cohort study of the association between alcohol consumption and gall bladder
Final Exam Version D
Please provide your name here: Angela Fleischer
Please answer the following items. Use the HIGHLIGHT function to provide your
response option. Each item will count 2 points. Once you complete the exam, please
submit your completed exa
Week 3 Assignment:
Chapter 5 Sullivan, Biostatistics Textbook, page 96, 5.8 Practice Problems 1, 3ab, 6 and
1. A recent study reported that the prevalence of hyperlipidemia (defined as total cholesterol
over 200) is 30% in children 2-6 years of age.
Q.1) The population of Metroville was 7,832,687 on January 1, 2015 and 7,436,355 on December 31, 2015. During 2
Given: Population of Metroville on January 1, 2015 =
Population of Metroville on Dec 31, 2015 =
Average population in 2015
Q.6) A clinical trial is conducted comparing a new pain reliever for arthritis to a placebo.
Particpants are randomly assigned to new treatment or placebo group.
Outcome is pain relief within 30 minutes.
No pain relief
Number of p
Week 5 Written Assignment_Odds Ratio
Q. 1a) The Study examined the effects of hormone replacement therapy on cancer, using two
groups. One group was cancer patients identified by using a cancer registry in Northern
California. The other group
Week 4_Written Assignment
This figure shows the gender wise, and age wise incidence rates of unknown disease in the
The incidence rate of the unknown disease is lowest in both genders, in the age group of 20-29
Magring of error = 15
Confidence level = 0.95
Population standard deviation = 68
Z at 95% confidence = 1.96
Sample size = [(1.96x68)/15]^2 = 78.96
There would be 79 students required to ensure that a 95% confidence interval estimate for
An investigator wants to estimate caffeine consumption in high school students.
The statement that " The estimate for the mean caffeine intake is within 15 mgs of the true mean" implies that th
Thus E is set up as E = 15 mgs.
PROBLEM # 1
Total Cholesterol levels
Xbar (Sample mean)
Standard deviation (S)
To find t : Since sample size is less than 30, we need to find the degree of freedom (df= n-1= 9-1=8)
Week 3 Written Assignment
Screen result positive 30 (True Positive)
40 (False Positive)
Screen result negative 10 (False Negative)
120 (True Negative)
Total number of people adm
a.) ^Y = 501.41 + 12.67(Supplements) 30.23(Duration of HIV
= 501.41 +12.67 x 1 30.23 x 2.5
So, the expected CD4 count for a patient taking supplements who had HIV for 2.5
years is 438.505.
b.) ^Y = 501.41 + 12.67(Supplements) 30.23(Dur
Text Book Section 7.11
Sample size (n)
Null value for total cholesterol (0)
After following the prescribed program of education on nutrition and exercise, the total cholesterol level was me
The results were as follows:
Children's mean choleste
Practice Problem #1
Study size (n)
Probability of being hyperlipidemic (P)
Probability of not being hyperlipidemic (1-P)
1b) Probability that exactly 3 are hyperlipidemic out of 12 (x)
Number of people not hyperlipidemic (n-x)
Q.6 ) Given:
Study conducted in HIV patients.
Primary outcome is CD4 cell count.
Investigators are interested in the association between vitamin and mineral supplements and CD4 cell counts.
A multiple regression analysis is performed relating CD4 count to
Week 5 Discussion
Informal Hypothesis: I hypothesize that men and women between the ages of 30-60 years who
have sleep apnea are more likely to develop high blood pressure, than men and women between
the ages of 30-60 years of age that do not have sleep a
Week 6 Discussion - Dependent and Independent Samples
Use the web site http:/jama.ama-assn.org/ to find an example of a research study that used two samples.
The Association Between Income and Life Expectancy in the United States, 2001-2014
Week 3 Discussion - Using Probability Sampling
Think again about the study you might conduct at your organization (from Week 2).
The health-related topic is adolescent tobacco use.
What probability sampling technique would be appropriate for your research
Week 1 Discussion - Role of Biostatistics
Name a news article that you have seen or read in the last three months that used
Teens with asthma almost twice as likely to smoke as their healthy counterparts
On what statistical data type was th
MPH 511 Week 2 Discussion
What research study might you conduct at your organization that is based on continuous
The health-related topic that I would be interested in is adolescent tobacco use.
The study will be quantitative on continuous data.
Assignment Week 4
Practice Problem 6.6
95% confidence level
Medication 2: Placebo
Practice Problem 6.8
Generate a 95% CI fo
y= CD4 count:
y= 501.41 + 12.67 (supplements)-30.23(Duration of HIV)
CD4 count for patients taking supplements for 2.5 years
The expected CD4 cell count for patient taking supplements with HIV for 2.5 y
Continouse outcome, one sample
ConclusionThe calculated sample size n is 79 students would be required to ensure a 95% CI w
One Sample dicotomous
Necessary sample size is 38