Problem regarding the smokestack scrubbers

Reference no: EM131008125

Smokestack scrubbers

Particulate matter is a serious form of air pollution often arising from industrial produc- tion. One way to reduce the pollution is to put a filter, or scrubber, at the end of the smokestack to trap the particulates. An experiment to determine which smokestack scrubber design is best was run by placing four scrubbers of different designs on an industrial stack in random order. Each scrubber was tested 5 times. For each run, the same material was produced, and the particulate emissions com- ing out of the scrubber were measured (in parts per billion).

Level n Mean StdDev

1 20 4.80000 4.57223

2 21 9.61905 4.12888

3 36 6.52778 3.83582

a) What kind of design or study is this?

b) What are the null and alternative hypotheses?

c) What does the ANOVA table say about the null hypoth- esis? (Be sure to report this in terms of sugar content and shelf placement.)

Dependent Variable: SUGARS

	I) SHELF	J) SHELF	Mean Difference (I-J)	Std. Error	P-value	95% Confidence Interval
Bonferroni						Lower Bound	Upper Bound
	1	2	- 4.819	1.2857	0.001	- 7.969	- 1.670
		3	- 1.728	1.1476	0.409	- 4.539	1.084
	2	1	4.819	1.2857	0.001	1.670	7.969
		3	3.091	1.1299	0.023	0.323	5.859
	3	1	1.728	1.1476	0.409	- 1.084	4.539
		2	- 3.091	1.1299	0.023	- 5.859	- 0.323

d) Can we conclude that cereals on shelf 2 have a different mean sugar content than cereals on shelf 3? Can we con- clude that cereals on shelf 2 have a different mean sugar content than cereals on shelf 1? What can we conclude?

e) To check for significant differences between the shelf means, we can use a Bonferroni test, whose results are shown here. For each pair of shelves, the difference is shown along with its standard error and significance level. What does it say about the questions in part d?

Reference no: EM131008125

Questions Cloud

Sketch a histogram for a distribution that is skewed to left : Sketch a histogram for a distribution that is skewed to the left. Suppose that you and your friends emptied your pockets of coins and recorded the year marked on each coin. The distribution of dates would be skewed to the left. Explain why.

Evaluation criteria for the different types of wind turbines : Work carried out to date (see the PPt slides, however most of the work done was theory and research between the literatures, here you need to add a table for evaluation criteria for the different types of wind turbines used for this purpose, facto..

The rest of our political system of representative democracy : The Federal Reserve System is structured in such a way as to insulate monetary policy from the political pressures characteristic of the rest of our political system of representative democracy.” Do you agree or disagree with this quote? Explain your..

Recession was the result of a supply shock or a demand shock : During the period 1973-1975, the United States experienced a deep recession with a simultaneous sharp rise in the price level. Would you conclude that the recession was the result of a supply shock or a demand shock? Illustrate, using AD-AS analysis.

Problem regarding the smokestack scrubbers : Particulate matter is a serious form of air pollution often arising from industrial produc- tion. One way to reduce the pollution is to put a filter, or scrubber, at the end of the smokestack to trap the particulates.

Why are you not surprised that most responses are multiples : Examine the data. Why are you not surprised that most responses are multiples of 10 minutes? We eliminated one student who claimed to study 30,000 minutes per night. Are there any other responses you consider suspicious?

Suppose an individual buyer values a pound of butter : Suppose an individual buyer values a pound of butter at $10. If the market price of butter is $8, what is the consumer surplus for this item?

The statement of retained earnings of gary larson : Also indicate any investing and financing activities you identify from this analysis that should be reported on the statement of cash flows.

Discuss the main pros and cons of taking import-replacing : Discuss the main pros and cons of taking the import-replacing road to industrialization versus concentrating government aid and private energies on developing new manufacturing exports.

User Account

All Pages