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Homework

Problem Set 6: due Wednesday, 2 December 2009

Textbook problems 11.9, 11.11.

Download the solution (final update, 6 December 2009)

Problem	Data file
11.9	Bearings.txt
11.11	Distill.txt

Note that computing the contrasts can be directly done with Excel, MATLAB, or a calculator. MINITAB can be used for the normal probability plots after the average responses and contrasts are computed.

You can turn this assignment in at the class meeting on 30 November, or drop it off before 5:00 PM on Wednesday, 2 December, in the MME office.

Problem Set 5: due Monday, 16 November 2009 (corrected)

Download a rough draft of the solution, updated late on 6 December 2009, with expanded discussion of the sample size problem.

1. You are asked to consult on the design of an experiment to measure the impact of nutrition on growth in middle school children. Group A will be free to eat any lunch items they choose. Group B will have their lunch planned by dietitians.
   1. How many students (total) will need to be in the sample to detect a 0.5 cm difference in height if a two-sided t-test will be used at 1 percent significance and 90 percent power? Assume that the standard deviation of the height of members of the population is 2 cm.
   2. What is the sample size if the standard deviation of the height of the population is 6 cm?
   3. What is the sample size if the standard deviation of the height of the population is 6 cm, and the size of a significant difference is considered to be 2.5 cm?
2. Textbook problem 10.9.
   Download the data set

Problem Set 4: due 26 October 2009

Textbook, problems 10.1a, 10.2a, 10.7a.

Download a a draft of the solution (PDF).

Download the data files for the textbook problems

Problem	Data file
10.1	popcorn.txt
10.2	Golfball.txt
10.7	plastic.txt

Problem Set 3: due 19 October 2009

Textbook, problems 9.17, 9.21, 9.26.

Download a the solution (PDF)

Note that MINITAB or R or MATLAB or Excel can be used to check your results. The solution you turn in for grading should have at least a sample manual calculation that shows you are not relying only on the software tools to do the analysis for you.

Download the data files for the textbook problems

Problem	Data file
9.21	Nickelbat.txt
9.26	concrete1.txt

Problem Set 2: due 12 October 2009

Textbook, problems 9.7, 9.11, 9.13.

Download a the solution (PDF).

Download the data files for the textbook problems

Problem	Data file
9.7	Raisins.txt
9.11	Nickelbat.txt
9.13	Airflow.txt

Problem Set 1: due 5 October 2009

Download the assignment. (PDF)

Download the the solution (PDF), updated 10 October 2009.

Download the data files for the textbook problems

Problem	Data file
2.15	noise2.txt
3.4a	voltage.txt
5.23	Bridge.txt