Introductory Biostatistics I
Homework 7
1. Serum cholesterol levels were measured in a group of 24 subjects on a macrobiotic diet,
aged 20-39 years. The sample mean was x 175 mg/dL with a standard dev
A
predictor variable may explain some
variation in a response variable , but
there may still be a large amount of
variation in that is left unexplained (2 is
small)
What if we considered the effects
Intermediate Biostatistics
Homework 7
Please write all homework solutions neatly, and circle/box your final answers. Do not write
solutions on this assignment sheet. You should use Stata to complete a
BIOS 3000: Intermediate Biostatistics
Homework 6
Please write all homework solutions neatly, and circle/box your final answers. Do not write
solutions on this assignment sheet. You should use Stata to
BIOS 3000
Kendal Blair
HW 1
1.
Test Statistic (X^2) = 2.1849, p-value = 0.335, df = 2
Since p= 0.335 and is greater than 0.05= alpha, fail to reject the null hypothesis to conclude
there is no relatio
We
already know how to compare the
means of two populations.
Typical hypotheses:
0 : = vs. :
Paired t-test
Independent samples t-test
Studies
dont always compare just two
groups
We need a metho
In
this section, we will focus on continuous
probability distributions.
A continuous random variable has infinitely
many values, and those values are often
associated with measurements on a
continuo
After
selecting a sample, we know the
responses for the individuals in the sample,
but we usually take a sample to infer some
conclusion about the population.
Since a different sample may lead to
di
In
this chapter, we will begin to work with
the true core of inferential statistics as we
use sample data to make inferences
about population parameters.
We must keep statistics and parameters
strai
Comparative
Studies are more convincing
than one-sample investigations.
Comparative inference is more common
than one-sample inference.
A common design uses one-sample
procedures to compare two gro
Data on two categorical variables are typically
presented in a tabular format known as a
contingency table, or two-way table.
Rows represent the categories of one variable
Columns represent the cate
BIOS 3000: Intermediate Biostatistics
Homework 2
You must show work or attach Stata output (including Stata commands that you used) to receive
credit for your work. No work/output results in no credit
Data are collected to help us understand
phenomena or answer scientific questions.
Often want to learn about the relationship
between an explanatory variable and
response variable.
A response variabl
Example
A study was conducted investigating the
relationship between smoking and aortic
stenosis (a narrowing or stricture of the aorta
that impedes the flow of blood to the body).
Since gender is as
In this section, we will begin to study the
relationships between continuous variables.
One way to measure an association is
correlation analysis.
Correlation: The quantification of the degree to
w
BIOS 3000: Intermediate Biostatistics
Homework 4
Please write all homework solutions neatly, and circle/box your final answers. Do not write
solutions on this assignment sheet. DO NOT use Stata to per
BIOS 3000: Intermediate Biostatistics
Homework 3
You must show work or attach Stata output (including Stata commands that you used) to receive
credit for your work. No work/output results in no credit
BIOS 3000: Intermediate Biostatistics
Homework 3
You must show work or attach Stata output (including Stata commands that you used) to receive
credit for your work. No work/output results in no credit
Epidemiologic studies usually compare the
frequency of disease (outcome) in two (or
more) groups according to a characteristic of
interest (exposure).
Use measures of association (risk ratios and
od
a.i. For alcohol DR, the data seems to be skewed to the left.
alcoh_dr rounded to nearest multiple of .1
plot in units of .1
0*
1*
2*
3*
4*
5*
6*
7*
8*
9*
10*
11*
12*
13*
14*
15*
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2
A PPENDIX
rn
Tables
825
Table 3 The normal distribution
(continued on nexi pagc
826
A PPENDIX
rn
Tables
Table 3 The normal distribution (continued)
(continued on next page)
A PPENDIX
.
Tables
827
Tabl
Introductory Biostatistics I
Homework 1
Due: August 24, 2017
1. The Human Papillomavirus (HPV) is sexually transmitted, and it is estimated that 75% of
the reproductive age population is infected with
Introductory Biostatistics I
Homework 2
Due: September 5, 2017
1. The Food-Frequency Questionaire (FFQ) is an instrument often used in nutritional
epidemiology to assess consumption of nutrients and v
Intermediate Biostatistics for Public Health Sciences
Homework 5
Please write all homework solutions neatly, and circle/box your final answers. Do not write solutions on
this assignment sheet. You mus
Name: _
BIOS 3000: Intermediate Biostatistics
Homework 2
1. Nicorette is a chewing gum designed to help people stop smoking cigarettes. Some patients have
reported mouth or throat soreness as a possib
Name: _
BIOS 3000: Intermediate Biostatistics
Fall 2015, Practice Test 2
1. Oysters are categorized for retail as small, medium, or large based on their volume. The grading
process is slow and expensi
Intermediate Biostatistics
Homework 7
1. Acclimation is a process of adaptation to a persistent change in environment taking place
typically over the course of weeks. When goldfish are relocated to a
BIOS 3000 - Intermediate Biostatistics
Homework 4
Please write all homework solutions neatly, and circle/box your final answers. Do not write solutions on this
assignment sheet. DO NOT use Stata to pe
Intermediate Biostatistics
Homework Assignment 3
1. Consider the following data collected to investigate infant survival. Each woman in the
study received prenatal care classified as less or more. Eac