Homework 4
YoungJin Ko
7.24. Decline in Male Births
Display 7.16 shows the proportion of male births in Denmark, the Netherlands, Canada, and the United
States for a number of years. Also shown are the results of least squares fitting to the simple linear
Chap 8: Overview of Experimental Design
STAT 3022
School of Statistics, University of Minnesota
Fall 2016
1 / 16
Randomization
To make useful conclusions, randomization is of essential
importance.
As we have seen before in the examples, both controlled
ex
Put your answers for multiple choice questions here (use capital letters):
1
A
2
C
3
C
4
D
5
C
6
B
7
B
8
C
9
B
10
A
Part #2 (30 points total) (Questions 11 - 15)
A certain Minneapolis company is interested in how much of a households garbage contains glas
Problem Set 2 Solutions
2.12. Marijuana Use During Pregnancy.
Y 2 Y 1 = 280 grams, SE(Y 2 Y 1 ) = 46.66 grams, d.f. = 1095.
(a) (Y 2 Y 1 )t1095 (.975)SE(Y 2 Y 1 ) = 280(1.962)(46.66) = 188.45 to 371.55 grams.
> qt(.975,df=1095)
[1] 1.962133
(b) (Y 2 Y 1 )
3.18 Trauma and Metabolic Expenditure
The following data are metabolic expenditures in eight patients admitted to a hospital for reasons other than
trauma and for seven patients admitted for multiple fractures (trauma).
Metabolic Expenditures (kcal/kg/day
STAT3022
Homework 2
YoungJin Ko
2.23 Speed Limits and Traffic Fatalities
What evidence is there that the percentage change was greater in states that increased their
speed limits? How much of a difference is there? [1] -22.31628
Statistical Report:
Accord
Homework 2
STAT3022
YoungJin Ko
2.23 Speed Limits and Traffic Fatalities
The National Highway System Designation Act was signed into law in the United States on
November 28, 1995. Among other things, the act abolished the federal mandate of 55-mileper-hou
STAT3022
YoungJin Ko
Homework #1
2.13 Fish Oil and Blood Pressure.
Reconsider the changes in blood pressure for men placed on a fish oil diet and for men placed on a regular
oil diet, from Chapter 1, Exercise 12. Do the following steps to compare the trea
STAT3022
YoungJin Ko
Homework #1
2.12 Marijuana Use during Pregnancy.
For the birth weights of babies in two groups, one born of mothers who used marijuana
during pregnancy and the other born of mothers who did not, the difference in sample
averages was 2
2.12 Marijuana Use during Pregnancy.
For the birth weights of babies in two groups, one born of mothers who used marijuana
during pregnancy and the other born of mothers who did not, the difference in sample
averages was 280g, and the standard error of th
Stat 3022 HW3 Solutions
Due date: Feb. 8th
Homework 3 Solutions
Problem 1
The report is omitted here. See Example Report for suggested format. Your
report should include a side-by-side histogram or boxplot, a Q-Q plot, and comments
on your graphs. As evid
STAT 3032: Lab11
Yannan Pan
April 26, 2016
Problem 10.2
10.2.1
As section 8.2.2 said, log(len) and shld should be included in the model.
data(Highway)
attach(Highway)
sigs1=(sigs*len+1)/len
# scope
m <- lm(log(rate) ~ log(len) + log(sigs1) + log(trks) + l
3022 HW 5.1 Solution
5.12
a. Identify the explanatory and response variables.
The explanatory variable is type of font, and there are four different fonts being used. The response variable
is the final exam score, which is being used as a measure of stude
13.3 Chapter Summary
505
13.3
Chapter Summary
Multiple samples from a population may be used to estimate its size. In the simplest
form, two independent SRSs are taken and the number of population units found
in both SRSs is used to estimate the populatio
attach(UBSprices)
x <- bigmac2003
y <- bigmac2009
m=lm(y~x, data=UBSprices)
plot(y~x)
abline(m,col="blue") # The ols fitted line
abline(0,1,col="red") # The line y=x
plot(log(y)~log(x)
n=lm(log(y)~log(x)
abline(n)
summary(n)
#2.1.3
attach(Htwt)
m1<- lm(wt
3022 HW 4.1 Solution
Q1
1. Textbook 4.10
library(Stat2Data)
data(ReligionGDP)
a.
We compute the natural logarithms of the GDP data and store the results in LogGDP. A scatterplot of
LogGDP versus Religiosity is shown below. We see a negative association so
Stat3022 HW6.1 Solution
Problem Set 6.22
The total number of observations is 100 for this problem.Also provide the three
p-values for Face, Gender and their interaction.
The df for both Face and Gender is 1 since each factor has two levels. The interactio
6.2 - Addressing Violated Assumptions Through Transformation | STAT 461
1 of 8
https:/onlinecourses.science.psu.edu/stat461/node/50
Analysis of Variance
We can often correct non-normality and unequal variances by transforming the response variable. That i