Exam 3
Review
1. The Cornell Cooperative Extension reports that the mean weight of Angus steers is 1152
pounds. Suppose that the weight of such animals can be described by a Normal model with a
standa
Practice problems: Census, sampling methods, observational studies, experiments,
blocking, blinding.
1. An education researcher randomly selects 48 middle schools and interviews all the
teachers at ea
Displaying categorical data HW
3.1 Each person in a nationally representative sample of 1252 young adults age 23 to 28 years
old was asked how they viewed their financial physique (2009 Young Adults &
1. The random Variable X has pdf
random variable
Y=
1
.
X
3e3 x
f ( x) =
0
0< x
.
x0
Use the CDF technique to determine the pdf of the
c( x 2 + y) on the given region
otherwise
0
2. Let the joint p
1. The random Variable X has pdf
random variable
Y=
1
.
X
3e3 x
f ( x) =
0
0< x
.
x0
Use the CDF technique to determine the pdf of the
c( x 2 + y) on the given region
otherwise
0
2. Let the joint p
6. The joint pmf of the discrete random variables X, Y, and Z is given by
f X ,Y ,Z ( x, y, z ) =
1
( x + y 2 + z 3 ) for
504
From this we can determine
a) Determine
f XY ( x, y) =
x = 1, 2,3
y = 1, 2
1. The random Variable X has pdf
random variable
Y=
1
.
X
3e3 x
f ( x) =
0
0< x
.
x0
Use the CDF technique to determine the pdf of the
c( x 2 + y) on the given region
otherwise
0
2. Let the joint p
3.
Z=1
Z=2
X
Y
X
1
2
3
1
.001
.002
.003
2
.006
.005
.004
3
.007
.008
.009
a) Determine
Y
f XY ( x, y)
X
Y
1
2
3
1
.101
.072
.063
2
.106
.200
.064
3
.167
.108
.119
b) Determine
f X ,Y | z = 2 ( x, y )
1. The random Variable X has pdf
random variable
Y=
1
.
X
3e3 x
f ( x) =
0
0< x
.
x0
Use the CDF technique to determine the pdf of the
c( x 2 + y) on the given region
otherwise
0
2. Let the joint p
1. The random Variable X has pdf
random variable
Y=
1
.
X
3e3 x
f ( x) =
0
0< x
.
x0
Use the CDF technique to determine the pdf of the
c( x 2 + y) on the given region
otherwise
0
2. Let the joint p
1. The random Variable X has pdf
random variable
Y=
1
.
X
3e3 x
f ( x) =
0
0< x
.
x0
Use the CDF technique to determine the pdf of the
c( x 2 + y) on the given region
0
otherwise
2. Let the joint pd
1. The random Variable X has pdf
random variable
Y=
1
.
X
3e3 x
f ( x) =
0
0< x
.
x0
Use the CDF technique to determine the pdf of the
c( x 2 + y) on the given region
otherwise
0
2. Let the joint p
Introduction
Microsoft Excel features statistics in two places: in the list of available functions under
Insert on the menu bar, and in Data Analysis under Tools. If you dont see a Data
Analysis item,
Chapter 0
Introduction
0.1 Welcome!
Welcome to the exciting world of statistics, as it can be done on the Texas Instruments
TI-83 calculator. As we progress through this manual, you will see that the
Practice problems Sampling Methods
1. Various claims are often made for surveys. Why is each of the following claims not
correct?
a) It is always better to take a census than to draw a sample.
b) Stop
3.3 4* For each of the following statements. identi'
die number that appears in boldface type as the value of
either a population characteristic or a statistic:
a. A departtnent store reports that 34
Exam 4 - Review
1. It is thought that the glycemic index (GI) of food is an indicator of how sustaining or satisfying it
is and may influence appetite. A sample of 15 children were provided with a bre
Practice Exam 2
Summer 2014
1. IQtestscorescanbemodeledwithaNormalmodelwithmean100andstandarddeviation16.
A. Choose the model that correctly shows the 68-95-99.7 rule (empirical rule) for the scores.
Dealing with Data
(references: Learning statistics with R & Lock^4)
What is statistics? Whats it there for? And why are scientists so bloody obsessed with
it? As a society, we have become obsessed kno