Nested and split-plot designs, Science

1. How much variation is there in the routine analysis of fibre content of soya cotton cakes? The data are presented by the lab that did the test and the technician within the lab that did the analysis.

(Data from Clarke and Kempson)

To perform an appropriate analysis, you will need 3 columns, one for the responses, one indicating the lab and one indicating the technician. When specifying your model, remember that technicians are nested within labs (so you could number the technicians from 1 to 9 if you wanted). Write down the two null hypotheses. Check whether or not the assumption of normality is justified. Give a 2 or 3 sentence summary of your conclusions.

1907_table1.png

2. Commercial respirators include filters to protect against particulate matter. There are two manufacturers of such filters and three filters were selected at random from each manufacturer. Each filter was tested three times. \The measurements are the percent penetration by a standard type of aerosol." (from Kuehl, including data)

300_table2.png

(a) Using these data , write down the appropriate linear model.

(b) Compute the analysis of variance table, including the expected mean squares.

(c) Check for normality.

(d) As the assumption of normality is not satisfied, replace the responses by their ranks and repeat

the analysis on the ranks. Have your conclusions changed?

(e) Write a 1 or 2 sentence summary of your conclusions.

3. Montgomery (2007) describes an experiment to study pigment dispersion in paint. Four mixes of a pigment are used. Each day all four mixes are prepared and then applied to three panels with each panel receiving paint by one of three application methods (brush, roller, spray gun). The experiment is repeated on a second day. Perform an appropriate analysis and comment. (Hint: consider the paper tensile strength example.)

246_table3.png

Posted Date: 2/19/2013 5:02:47 AM | Location : United States







Related Discussions:- Nested and split-plot designs, Assignment Help, Ask Question on Nested and split-plot designs, Get Answer, Expert's Help, Nested and split-plot designs Discussions

Write discussion on Nested and split-plot designs
Your posts are moderated
Related Questions
Define White Blood Corpuscles as Internal Defence Mechanism The white blood cells are probably the most important part of our immune system. You may recall reading about the wh


Aspirations: We often have to make decisions and choices about hdw  to spend our time, money and energy. Sometimes  the choices are simple like whether to wear a blue dress or

Microwave Processing Factors Frequency: There are two available frequencies for microwave heating - 915 and 2,450MHz; the frequency affects the depth of penetration into

The effect of soil on growing things Get samples of a fertile soil from a flower or vegetable garden, from a wood, from a place where a cellar is life form dug, from a sandy pl

INTRODUCTION : You have studied about the hazards of electricity in Unit 11 of Block 3. You have learnt that most of the electrical accidents like shock, fire, etc. occur often du

Role of Bile in Digestion Bile is produced by  liver and stored in gall bladder. During digestion,  the gall bladder contracts  and supplies bile, rapidly to the duodenum throu

Moisture comes from home plants Place a cellophane bag over a leaf of some house plant or garden plant and close the end about the stem with a rubber band. Make an observation

To show how water rises by capillarity Colour some water in a shallow dish with ink and touch a blotter to the water surface. Observe how the water increases in the blotter.

For water immiscible/insoluble liquid/solid wastes which can be emulsified The spillage of water immiscible/insoluble liquid/solid could be scrubbed with brush in presence of