Biostatistics 310
Sample Midterm Exam 1 KEY
15 POINTS TOTAL
Name: _
Make sure you show your work!
You may leave expressions unevaluated
1. [2 points] For each of the following indicate what the best description of the type of data is:
a) (1 pt) Socioecono
Quantifying disease and risk
Prevalence
Cumulative incidence & Incidence
Relative risk & Risk difference
Odds & Odds ratio
123
Does Vitamin C prevent colds?
124
Vitamin C and Colds
Linus Pauling, Ph.D. (1901-1994), is the only person ever to win two
Study Design Topics to be covered
Common study designs
Case report (series)
Ecologic study
Cross-sectional survey
Cohort study
Case-Control study
Randomized clinical trial
Meta-analysis
Ecologic fallacy
Observational vs. Experimental studies
C
Confidence intervals
By providing a range of values for the summary of interest (e.g. for a
proportion or a mean) with a given level of confidence (a confidence interval),
we can incorporate sampling variability in our estimate
E.g. if, in a sample of
Biostat 310
Spring 2017
Homework 3 - Solutions
Total Points: 15 points
There is a total of 10 graded points (questions indicated by *) and then an additional 5 points
in total for the additional questions without an asterisk, graded according to:
Biostat 310
Spring 2017
Homework 4 - Solutions
Total Points: 15 points
There is a total of 10 graded points (questions indicated by *) and then an additional 5 points in total for
the additional questions without an asterisk, graded according to
Sullivan (2nd edition)
p-values reflect the exact significance of tests of hypothesis. In this
example, we find p < 0.010, indicating that there is less than a 1%
chance that we are incorrectly rejecting the null hypothesis if the
null hypothesis is t
BIOSTAT 310
Midterm 1 Review
1
Review Topics
Types of Data
Graphs
Summary Statistics
Measures of Disease Frequency
Comparing Disease Frequency in Two Groups
Sampling
Types of Studies
2
Types of Data
Categorical
Nominal Unordered categories
Ordin
Biostat 310
Homework 2
Submit to the CANVAS course website
DUE: 10/16/15, 11:30am
[15 points]
There are a total of 13 graded points (questions indicated by *) and then an additional 2
points in total for the additional questions without an asterisk, grade
Biostat 310
Homework 3
Submit to the CANVAS course website
DUE: 10/23/15, 11:30am
[15 points]
There are a total of 13 graded points (questions indicated by *) and then an additional 2 points in total for the
additional questions without an asterisk, grade
Biostat 310
Homework 5
Submit to the CANVAS course website
DUE:11/06/15, 11:30am
[14 points]
There are a total of 12 graded points (questions indicated by *) and then an additional 2 points in total for the
additional questions without an asterisk, graded
Biostat 310 Review: Fall 2015
Summarizing Categorical and Quantitative Data
Categorical data nominal (unordered categories), ordinal (ordered categories)
Graphical bar plots (frequency of each category), pie charts
Numerical tables, frequencies, proport
Biostat 310
Homework 8
Submit to the CANVAS course website
DUE: 12/11/15, 11:30am
[14 points]
There are a total of 12 graded points (questions indicated by *) and then an additional 2 points in total for the
additional questions without an asterisk, grade
Biostat 310
Homework 6
Submit to the CANVAS course website
DUE:11/13/15, 11:30am
[15 points]
There are a total of 13 graded points (questions indicated by *) and then an additional 2 points in total for the
additional questions without an asterisk, graded
Biostat 310
Homework 7
Submit to the CANVAS course website
DUE:12/04/15, 11:30am
[15 points]
There are a total of 13 graded points (questions indicated by *) and then an additional 2 points in total for the
additional questions without an asterisk, graded
Week 1
4.0
Summarizing Data Collected in the Sample
Define the population explicitly because inferences based on the study
samples would be generalizable to the specified population.
Population: collection of all individuals about whom we want to make
gen
Biostat 310
Homework 1
Submit to the CANVAS course website
DUE: 10/9/15, 11:30am
TOTAL: 15 POINTS
There are a total of 13 graded points (questions indicated by *) and then an additional 2 points in total for the
additional questions without an asterisk, g
Probability & Screening
Probability is used in a variety ways:
To define independence
To describe test performance
To construct confidence intervals
To perform hypothesis testing
A p-value is a probability
Probability distributions are used to cal
Tobias Kim
Biostat 310
February 20th, 2017
Term Paper: Laughing is the best medicine
A study conducted by researchers at the University of Oxford attempted to
determine whether or not laughing had the capacity to increase pain tolerance.
Researchers achie
Tobias Kim
Biostat 310
1. Prevalence
2.
a. 14 contract flu / 20.5 = 0.683 cases per person year
b. 2 contract flu/ 120 = 0.017
c. 14 contract flu/ 120= 0.117
d. No, because by week 10, each student isnt followed for the same
amount of time, as 5 have drop
Tobias Kim
Biostat 310
1.
a. Scatterplot
b. Ii.) Systolic blood pressure tends to be higher at older ages; the
correlation is about 0.4
2.
a. 200/500= 0.4
b. Yes, because according to the collected data, the probability of an
individual having NYHA I and
Tobias Kim
BIOSTAT 310
1. Cancer growth rates may have increased due to:
a. Increase in populations (population growth)
b. Rise in more strains of cancer
2. The data shown does not suggest that you can increase your FEV by smoking,
because majority of the
Danish Study Links Fish Oil During Pregnancy With Lower Asthma Risk In Kids3:
December 28, 20165:01 PM ET
RICHARD HARRIS
Studies of fish oil and health are like studies about coffee there's plenty of contradictory
information out there.
With that in mind,
Study reveals laughter really is the best medicine
By Pallab Ghosh Science correspondent, BBC News
14 September 2011
People feel less pain after a good laugh, because it may cause the body to release chemicals that
act as a natural painkiller, research ha
Biostatistics 310
Term Paper Assignment
The objective of this assignment is two-fold:
1) To develop your ability to critically evaluate news reports on medical and public health issues
2) To practice writing skills
Assignment: You will be assigned one of
Final Review
BIOSTAT 310
1
Topics covered in Biost 310
Summarizing Categorical and Quantitative Data
Probability and Screening
Prevalence, Incidence, Relative risk, Risk difference, Odds ratio
Sampling, Bias
Study Design
Binomial, Normal
Sampling distribu
Early Bedtime For Preschoolers Might Help Reduce Obesity Risk Later
July 14, 20161:36 PM ET
CAROLYN BEANS
For parents concerned that their preschoolers may one day gain excess weight, a study published
Thursday suggests one strategy for keeping the little
For Young Kids' Ear Infections, Longer Antibiotic Treatment Works Better
December 21, 20165:01 PM ET
KATHERINE HOBSON
Researchers looking into whether a shorter course of antibiotics would treat young children's ear
infections as well as a longer course f