Question3:An aluminum master alloy manufacturer producesgrain refiners in ingot form. The company produces the prod-uct in four furnaces. Each furnace is known to have its own (a) Is there any evidence that stirring rate affects grainunique operating characteristics, so any experiment run in thefoundry that involves more than one furnace will consider fur- (b) Graph the residuals from this experiment on a normalnaces as a nuisance variable. The process engineers suspectthat stirring rate affects the grain size of the product. Each fur-nace can be run at four different stirring rates.size?probability plot. Interpret this plot.(c) Plot the residuals versus furnace and stirring rate. Doesthis plot convey any useful information?(d) What should the process engineers recommend con-cerning the choice of stirring rate and furnace forthis particular grain refiner if small grain size isFurnaceStirring Rate (rpm)134desirable?58.46.101456.9.15146.6.2017936.2.

An aluminium master alloy manufacturer produces grain refiners in ingot form. The company produces…

Answered: An aluminum master alloy manufacturer…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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1. Two correlation coefficients obtained from samples of size 23 and 28 were computed to be 0.80 and 0.95, respectively. To conclude at levels of 0.05 that whether there is a significant difference between them: a) Compute the test statistics? b) What is your conclusion?
It is hypothesized that the total sales of a corporation should vary more in an industry with active price competition than in one with duopoly and tacit collusion. In a study of the merchant ship production industry it was found that in 4 years of active price competition, the variance of company A’s total sales was 114.09. In the following 7 years, during which there was duopoly and tacit collusion, this variance was 16.08. Assume that the data can be regarded as an independent random sample from two normal distributions. 1. Test, at the 5% level, the null hypothesis that the two population variances are equal against the alternative that they are not equal.
Seedlings of understory trees in mature tropical rainforests must survive and grow using inter- mittent flecks of sunlight. How does the length of exposure to these flecks of sunlight (fleck duration) affect growth? Leakey et al. (2005) experimentally irradiated seedlings of the Southeast Asian rainforest tree Shorea leprosula with flecks of light of varying duration while maintaining the same total irradiance to all the seedlings. Their data for 21 seedlings are listed in the following table. i. What is the rate of change in relative growth rate per minute of fleck duration? provide a standard error for your estimate. ii. using these data, test the hypothesis that fleck duration affects seedling growth rate. iii. Calculate a 99% confidence interval for the slope of the population regression.
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