Chapter 6
Section 6.2
Transforming and Combining
Random Variables
Warm up
Weights of three-year-old females
The weights of three-year-old females closely follow a
Normal distribution with a mean of 30.7 pounds and
a standard deviation of 3.6 pounds. Rando
Warm Up Test
Review
Marginal and Conditional
Researchers looking at the relationship between the type of college attended (public or private) and
achievement gather the following data on 3265 people who graduated from college in the same year.
The variabl
Using the Equation Editor
Inserting an Equation
To insert an equation, do one of the following.
Word :
WordPerfect :
Insert / Object / Microsoft Equation 3.0
Insert / Equation
If you are using Word on your home computer, you may want to add the equation
e
H 524: PROBLEM SET 3 SOLUTIONS
NOTE: Since I photocopied some of the answers from the solution manual for the book,
this solution set contains answers to some problems that werent assigned.
Chapter 9
Exercise 2:
If we collect many, many random samples all
H 524: Problem Set 5 Solutions
Chapter 11
5. This study generated paired data. From each subject, we collect the pair (LDL cholesterol under corn
flakes, LDL cholesterol under oat bran). Let 1 denote the mean LDL cholesterol level in the population
of hyp
Readings from the textbook
Chapters 15 & 16
Problems to be turned in for grading
Chapter 15: 8 (hint: part c is asking you to use the methods from week 7)
(10 points)
P1=P2 :
a. H0 =
The population proportion of students who drove while drinking is
the sa
H 524: PROBLEM SET 2 SOLUTIONS
CHAPTER 6
Exercise 6.
We can compare two population proportions using the relative risk, odds ratio,
risk difference.
Exercise 19.
a. The probabilities of suffering from persistent respiratory symptoms by
socioeconomic statu
H 524: Problem Set 4 Solutions
Chapter 10
10a.
H 0 = mean WBC count among persons infected with E. canis is 7250/mm 3
Ha
= mean WBC count among persons infected with E. canis is < 7250/mm 3
Note: its fine if you wrote Ho: mean WBC count among persons infe
H 524: Problem Set 7 Solutions
Problem 1
A clinical trial designed to evaluate whether or not patients with coronary artery disease
respond to treatments heparin and enoxaparin. Estimate
RD = pH - pE
RR = pH / pE
OR = pH/(1- pH) / pE / (1-pE)
where pH den
H 524: PROBLEM SET 1 SOLUTIONS
CHAPTER 3
Exercise 6:
a)
Find the following numerical summary measures of the data:
i.
ii.
iii.
iv.
v.
vi.
mean: 25.91 month.
median: 24 month.
mode: 12 and 24 month.
range: 96-0.1 = 95.9 months.
interquartile range: (39 2.2
H 524: Problem Set 6 Solutions
ANOVA Exercise
Compare the mean changes in fat-free mass for women after 16 weeks on an aerobics, modern dance, or
control program.
a) Boxplots
-2
Change in Fat-Free Mass
0
2
4
6
Stata command: graph box diff, over(group) yt
Chapter 17, Problem 5,
Principles of Biostatistics
Pagano& Gauvreau
Problems to be turned in for grading
5
triglyceride
10
15
Chapter 17: Problem 5 (10 points)
a. Construct a two-way scatter plot for these data:
In Stata, using twoway (scatter triglycerid