1
Stat 231 Homework Assignments/Fall 2010
HW1/ Due 8/26/10
1.
Do Devore Chapter 1 Problem 42.
2.
Do Devore Chapter 1 Problem 51 "by hand."
That is, do the arithmetic required to
compute the sample variance and sample standard deviation.
Check your computations
using a good scientific calculator (you need to know how to compute means and standard
deviations using your calculator).
Be sure to write correct units for
2
s
and
s
.
3.
Do Devore Chapter 1 Problem 64 "by hand."
That is, do the arithmetic required to
compute the two sample means and two sample standard deviations.
Check your
computations using a good scientific calculator (you need to know how to compute
means and standard deviations using your calculator).
Be sure to write correct units for
the
x
and
s
values.
4.
Load the data from Devore's Example 1.9 into
JMP
.
Use the
Analyze>Distribution
function to get,
print out, and turn in with this homework
a
JMP
report that includes
a)
a histogram matching the one in the text as closely as is possible (run the data axis
from 1 to 19 and use increments of 2),
b)
a quantile box plot,
c)
a stem and leaf plot, and
d)
the sample mean and standard deviation
for these data.
5.
Load the data from Devore Chapter 1 Problem 75 into
JMP
.
Use the
Tables>Stack
function to get the data values into a single column and the labels into
another one.
Then make, print out, and turn in with this homework the comparative
(quantile) box plots Devore asks for in two different ways.
a)
Use the
Analyze>Distribution
function plotting
Data
by
Label
and
then using horizontal layouts to stack the
JMP
reports over one another.
b)
Use the
Graph>Graph Builder
function, plotting
Data
on the "y" axis and
Label
on the "x" axis, and then adding the box plots.
HW2/Due 9/2/10
Do Devore Chapter 2 Problems 1,3,5,8,11,12,14,15,19,20,26,47,48,52,53,63,67.
HW3/Due 9/9/10
Do Devore Chapter 2 Problems 29,32,34,38,71,77,78,79,80.
Do Devore Chapter 3
Problems 11,12,13,22,23,29,31,35,36,39.
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HW4/Due 9/16/10
1.
Use
JMP
and make "spike graphs"
to the same scale
for probabilities from all of the
following discrete distributions:
a)
the Binomial distributions for
5
n
and
.1,.2,.5,.8
p
,
b)
the Geometric distributions for
.1,.2,.5
p
, and
c)
the Poisson distributions for
.5,1,2,4
.
Make these plots of probability mass functions
vs
f
xx
for
0,1,2,
,19
x
.
You can
do this by
a)
adding 20 rows to an initial data table and creating a first column (label it "
x
")
using a formula that is
Row()1
(this gives "
1
row number
" ) (you'll find
"
Row
" under the grouped "
Row
" functions menu in the "
Formula
" menu),
b)
adding columns to the data table for each of the distributions indicated above
(you'll find appropriate probability mass functions under the grouped
"
Discrete Probability
" functions menu in the "
Formula
" menu)
1
, and
c)
using the
Graph Builder
function with
x
on the horizontal axis and the
various probability function values on the vertical axes.
If you rightclick on each
graph, you'll be able to remove the "
smoother
" and add "
bars
" to make the
desired plots.
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 Fall '08
 Staff
 Normal Distribution, Standard Deviation, Variance, DeVore, Devore Chapter

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