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22S:30 and 22S:105
Statistical Methods and Computing
2
Bar charts for nominal and ordinal data
present a frequency distribution in visual form
categories that are possible values of the variable are
listed on horizontal axis
Graphical Depiction of Qua
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2
The mean is meaningful only for quantitative data (either discrete or continuous).
22S:30/105
Statistical Methods and
Computing
Example regarding a discrete variable: We
hear reports such as that the average number of children per family is 1.9.
Meas
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22S:30/105, Statistical Methods and Computing
Instructor: Cowles; Spring 2008, Homework 9
Due: Fri. Apr. 18 in class
1. Texbook problem 20.31. Check whether the rules ofthumb for using the normal theory
approximation are met. Then compute the requested
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22S:30/105, Statistical Methods and Computing
Instructor: Cowles
Spring 2008, Homework 1
Due: Fri., 02/01 in class
Please put your name at the top of your homework, and list the names of any classmates
with whom you collaborated.
1. For the years
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9.14. (a) Completely randomized design: Randomly assign 15 students to Group 1 (easy
mazes) and the other 15 to Group 2 (hard mazes). Compare the time estimates of Group I
with those of Group 2. (h) MatcMd-pairs design: Each student does
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22S:30/105, Statistical Methods and Computing
Instructor: Cowles; Spring 2009, Homework 7
Due: Mon. 3/30 in class
1. Textbook problems (do by hand or with calculator): 15.26, 15.27, 15.36, 15.43,15.44,
15.51, 15.52.J,~7- lA.R
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3. 'Fextbook I'reaie
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22S:30/105, Statistical Methods and Computing
Instructor: Cowles; Spring 2008, Homework 6
Due: Wed. Mar. 26 in class
1. Textbook problems: 11.10, 11.25, 11.36, 14.22, 14.24, 14.29 (see below), 14.30, 14.32,
For proble
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22S:30/105, Statistical Methods and Computing
Instructors: Cowles and Tan Spring 2010, Homework 7
Due: Fri. Mar. 26 in class
1. Textbook problems (do by hand or with calculator): 16.7, 16.8
2. Textbook problems (use SAS for calculations; write out a
259
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Mmitab,~lj>ut
23.42. (a) This is not an e~perill1ent; no
LIeatment wa." assigned to the ~ub
jl."Cts. (bl A high nonresponse rate
might mean that our attempt to get a
random sample W:l.II thwarted because
of those who did not participate;
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22S:30/105, Statistical Methods and Computing
Instructor: Cowles; Spring 2008, Homework 8
Due: Fri. Apr. 11 in class
1. See the data file 'caffeine.dat' and associated information file 'caffeine.info' on the
course web page.
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(a) Use these data
Instructor: Cowles
Spring 20] , Homework 4
Due: Fri., 02/18 in class
Please put your name at the top of your homework , and list the names of any classmates
with whom you COllaborated,
I. Textbook problems:
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i
)S. t)2, ~36 , ~2, ~.ll ,
5.28
Textbook problems 25.36, 25.37, 25.41
287
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25.J7~
First. we note thRllhe mean angle for untreated fabric ill 11 degrees. showing much leu
wrinkle le"isUlnce than any of lhe trclued fabrics. ANOVA on fOUl" @nlUp' give! F
15:1.16
and P < 0.00 I.
22S:30/105, Statistical Methods and Computing
Instructor: Cowles
Spring 2011, Homework 5
Due: Wed ., 02/23 in class
Please put your name at the top of your homework, and list the names of any classmates
with whom you collaborated .
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22S:105
Statistical Methods and Computing
2
What is statistics?
Statistics is the science of using data to make decisions
and answer questions.
Introduction
Statistics involves
designing studies
collecting data
organizing and analyzing data
interp