1
Stat 231 Homework Assignments/Fall 2011
HW1/ Due 8/25/11
1.
Do Devore Chapter 1 Problem 42.
(It's possible to use algebra to prove the
relationships you are supposed to find here, but it will be sufficient for this exercise to
use the numbers
2,3,3,4,5
as values of
x
, and try out your conjecture with
c
first 3
and then 7.)
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 absolutely must know how to compute means and
standard deviations using your calculator).
Be sure to write correct units for
2
s
and
s
.
3.
Consider the data of Devore Chapter 1 Problem 75.
Do the arithmetic required to
compute the three sample means and three sample standard deviations.
Check your
computations using a good scientific calculator (again, 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 1.10 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
.
If necessary, 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 9/1/11
Do Devore Chapter 2 Problems 1,3,4,8,11,12,14,15,19,20,26,47,48,52,53,63,67.

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