CHAPTERS
Exercise 9
a. The distribution of means of samples of size 10 has mean J.L = 0, standard error
a / y'n = 1/ JIO = 0.32, and is normally distributed. (Since the underlying population is itself
normal, this is true for any sample size n.)
b. The pr

Nominal Data-diff values possible have no natural order (single, married, divorce; male, female; etc.)
Ordinal Data-is a natural ordering among category values (injury severity scale, activity level, etc.)
Dichotomous/Binary Data-variable takes on two val

Discussion 4
22S:101:BBB
Biostatistics
1. A marksman blindfolds himself and thinks that on average he
will hit the target 4 out of 5 times.
(1) If he fires 4 shots, whats the probability of more than 2
misses if he is right about his hitting percentage?
(

Discussion 3
22S:101:BBB
Biostatistics
1. A room contains 6 male and 4 female students. Students leave the room one-ata-time, in random order. Let N denote the number of male students who are
preceded immediately by one female student (for example, in the

Discussion 2
22S:101:BBB
Biostatistics
1. A doctor is studying the relationship between blood pressure and heartbeat
abnormalities in her patients. She tests a random sample of her patients and notes
their blood pressures (high, low, or normal) and their

Discussion 1
22S:101:BBB
Biostatistics
1. For a fair 6-sided die,
(1) Whats the probability of getting an even number in one toss?
(2) Whats the probability of getting 1 or 2 in one toss?
(3) Are the two events described in (1), (2) mutually exclusive? In

22S:101
QUIZ #3
Due Friday 16 Nov
Print name_
1)
Suppose your prior distribution for = the success rate of a drug is beta(12, 4). You observe
15 successes and 10 failures in an experiment. Use the appropriate table on the back page of
this exam to determi

22S:101
Midterm#2
1 Nov 2012
Print name_
1)
Suppose your prior distribution for = the success rate of a drug is beta(12, 4). You observe
15 successes and 10 failures in an experiment. Use the appropriate table on the back page of
this exam to determine an

Discussion 6
22S:101:BBB
Biostatistics
1. Let denote the proportion of all depression patients that
can benefit from a new medicine, and the proportion of
all depression patients that can benefit from taking a
placebo. Assume , have independent uniform[0,

Discussion 5
22S:101:BBB
Biostatistics
1. Let denote the proportion of all asthma patients that
can benefit from a certain new medicine.
(1)If has a uniform[0,1] prior, compute the 95% credible
interval for .
(2)If has a Beta(21,16) prior, obtain the 95%

Discussion 7
22S:101:BBB
Biostatistics
1. Suppose the frequentist p-value for a test of H:
vs. A:
is 0.06. If we use independent uniform
priors on and , what Bayesian conclusion can we make?
2. Denote
= the odds ratio of heavy over light smoking
and simil

Discussion 8
22S:101:BBB
Biostatistics
1. In a random sample of 100 male and 125 female Iowa
residents, the average LDL cholesterol level for the males
are 180 (mg/dL) with standard deviation 30, while the
average for the females are 170 with standard dev

Discussion 10
22S:101:BBB
Biostatistics
1. Scatterplots of y vs. x, x vs. z, z vs. y are shown below. What can you
conclude about the relations among them?
2. Suppose we have following data:
3
1
Can you calculate the slope and intercept
regression line
?

Discussion 9
22S:101:BBB
Biostatistics
1. Based on a sample of size 20, a frequentist provides the confidence interval
[134, 140] for the average triglyceride level of a population of cardiac
patients. Use this information to compute P( > 139 | data).
2.

Discussion 10
22S:101:BBB
Biostatistics
1. Age and systolic blood pressure (SBP) among 5 adult women:
Age
SBP
27
106
41
139
32
122
51
144
59
157
Suppose a least square regression line of SBP vs. Age is already
obtained:
SBP = 72.3 + 1.46 Age
(1)Compute th

STAT:3510 (22S:101) BIOSTATISTICS
Chapter 3 Probability Distributions
Discrete Random Variables
For a given sample space S of some experiment, a random variable is a rule
(function) that maps each outcome in S to a numerical value. A random variable
is a

STAT:3510 (22S:101) BIOSTATISTICS
Chapter 1 Introduction to Data Analysis
Anticipated Learning Outcomes from the Course
At the end of the semester, a student is expected to
have knowledge on basic statistical methods commonly used in the biological
scien

S:101 Midt #1
practice
print name_sec_
1) Which data set corresponds to the histogram shown.
10
20
30
a) 12, 12, 32, 55, 56
40
50
60
b) 11, 33, 36, 36, 47
c) 12, 24, 36, 41, 58
c) 15, 21, 32, 39, 55
d) 15, 22, 35, 55, 59
2) Find the SD of the data set 102

S101 Homework
assignment must have a due date to be official
Assignment 1
1)
Suppose 15% of adult Iowans suffer from hypertension. Find the probability that
at least one of 8 randomly chosen Iowans suffers from hypertension.
2)
One patient is randomly sel

17.
Correlation: measure of the strength of a linear relationship between two continuous variables
Regression analysis: highly related to
correlation, but where one of the variables is used to predict the other Parameters from a regression of Y on X will

Syllabus: 22S:101:BBB Spring 2013
Title & Number(s): Biostatistics 22S:101:BBB; STAT:3510:0BBB
Department: Statistics and Actuarial Science 241 SH
DEO: Luke Tierney, 241 SH, statistics@uiowa.edu, 335-0712
Instructor: George Woodworth
George-woodworth@uiow

22S:101:CCC
First Name:
Discussion Section Number:
Biostatistics
Practice Midterm-I
Last Name:
This exam contains 17 multiple choice questions (please circle only one choice for each
question) each worth 3 points, and 1 non-multiple choice question worth

22S:101:CCC
Biostatistics
Practice Midterm-II
Last Name:
First Name:
Discussion Section Number:
This exam contains 17 multiple choice questions (please circle only one choice for each
question) each worth 3 points, and 1 non-multiple choice question worth

22S:101:CCC
First Name:
Discussion Section Number:
Biostatistics
Practice Final Exam
Last Name:
This exam contains 23 multiple choice questions (please circle only one choice for
each question) each worth 3 points, and 2 non-multiple choice questions each

22S:101:CCC
Biostatistics
Practice Midterm-II
Last Name:
First Name:
Discussion Section Number:
This exam contains 17 multiple choice questions (please circle only one choice for each
question) each worth 3 points, and 1 non-multiple choice question worth

22S:101:CCC
First Name:
Discussion Section Number:
Biostatistics
Practice Midterm-I
Last Name:
This exam contains 17 multiple choice questions (please circle only one choice for each
question) each worth 3 points, and 1 non-multiple choice question worth

STAT:3510 (22S:101) CCC
First Name:
Discussion Section Number:
Biostatistics
Quiz 4 (10 pts)
Last Name:
1. Consider the t distribution with 6 degrees of freedom.
a) What proportion of the area under the curve lies to the right of t = 3.707? What proportio

STAT:3510 (22S:101) CCC
First Name:
Discussion Section Number:
Biostatistics
Quiz 4 (10 pts)
Last Name:
1. Consider the t distribution with 9 degrees of freedom.
a) What proportion of the area under the curve lies to the right of t = 4.781? What proportio

STAT:3510 (22S:101) CCC
First Name:
Discussion Section Number:
Biostatistics
Quiz 4 (10 pts)
Last Name:
1. Consider the t distribution with 15 degrees of freedom.
a) What proportion of the area under the curve lies to the right of t = 1.753? What proporti