40. In a study of processes used to remove impuritiesfrom cellulose goods ("Optimization of Rope-Range Bleaching of Cellulosic Fabrics," TextileResearch J., 1976: 493-496), the following dataresulted from a 2 experiment involving the desiz-ing process. The four factors were enzymeconcentration (A), pH (B), temperature (C), andtime (D).Starch %by WeightEn-Treat- zymement (gL) pH (C)Temp. Time1st2nd(hr) Repl. Repl.(1)a.b.60.060.060.06.9.80 14.046.50.7550.7550.755075506.06.09.72 13.5010.13 11.277.060.070.0ab7.06.11.80 11.306.06.12.70 11.37ac6.070.06.11.96 12.056.11.38 9.9270.070.060.060.060.060.070.070.070.070.0be7.07.0abc.6.11.80 11.1013.15 13.0010.60 12.3710.37 12.0011.30 11.6413.05 14.5511.15 15.006.0.75adbdabd6.050.757.07.06.06.07.07.0cdacd50.75508.12.70 14.1013.20 16.12bcdabcd.75a Use Yates's algorithm to obtain sums of squaresand the ANOVA table.b. Do there appear to be any second-, third-, orfourth-order interaction effects present? Explainyour reasoning. Which main effects appear to besignificant?

An experimental design is a way to carefully plan experiments in advance so that the results…

Answered: 40. In a study of processes used to…

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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The article "Lead Dissolution from Lead Smelter Slags Using Magnesium Chloride Solutions" (A. Xenidis, T. Lillis, and I. Hallikia, The AusIMM Proceedings, 1999:37-14) discusses an investigation of leaching rates of lead in solutions of magnesium chloride. The data in the following table (read from a graph) present the percentage of lead that has been extracted at various times (in minutes). Time (t) 4 8 16 30 60 120 Percent extracted (v) |1.2 1.6 2.3 2.8 3.6 4.4 a. The article suggests fitting a quadratic model y = Bo + B,t + Bz² + ɛ to these data. Fit this model, and compute the standard deviations of the coefficients. b. The reaction rate at time t is given by the derivative dy/dt = B, + 2B,t. Estimate the time at which the reaction rate will be equal to 0.05. c. The reaction rate at t = Oisequal to B1. Find a 95% confidence interval for the reaction rate at t = 0. d. Can you conclude that the reaction rate is decreasing with time? Explain.
For each of the following processes, describe the expected behaviour of the autocorrelation function (ACF) and partial autocorrelation function (PACF) plots: (a) White noise; (b) MA(3); (c) AR(2); (d) ARMA(3,1).
How would I solve this assuming the population variances are equal?
Answer the whole quesrion
2. A cohort study is conducted to assess the association between clinical characteristics and the risk of stroke. The study involves n = 1370 participants who are free of stroke at the study start. Each participant is assessed at study start (baseline) and every year thereafter for 5 years. The following data were collected relating hypertensive status measured at baseline to incident stroke over 5 years. Free of Stroke at 5 years Stroke Baseline: Not hypertensive 1000 50 Baseline: Hypertensive 300 50 Compute the cumulative incidence of stroke in patients classified as hypertensive at baseline.A)0.20B)0.50C)0.0625D)0.05
Q5: The theory that resistance by mosquitoes to an insecticide is due to a single dominant gene has been examined. Homozygous resistant mosquitoes were crossed with homozygous susceptible mosquitoes to give A heterozygous population. These were crossed to the homozygous susceptible population. Of this back cross progeny 465 were exposed to the insecticide, 264 died. Is the percentage killed significantly different to the percentage predicted by the model?
1. The data in Table 7–6 were collected in a clinical trial to evaluate a new compound designed to improve wound healing in trauma patients. The new compound was com- pared against a placebo. After treatment for 5 days with the new compound or placebo, the extent of wound healing was measured. Is there a difference in the extent of wound healing between the treatments? (Hint: Are treatment and the percent wound healing independent?) Run the appropriate test at a 5% level of significance. Use the data in Problem 1. Pool the data across the treatments into one sample of size n = 250. Use the pooled data to test whether the distribution of the percent wound healing is approximately normal. Specifically, use the following distribution 30%, 40%, 20%, and 10% and a = 0.05 to run the appropriate test. Percent Wound Healing Treatment 0-25% 26-50% 51-75% 76-100% New compound (n=125) 15 37 32 41 Placebo (n=125) 36 45 34 10
Skoog.151.7-22. Two different analytical methods were used to determine residual chlorine in sewage effluents. Both methods were used on the same samples, but each sample came from various locations with differing amounts of contact time with the effluent. Two methods were used to determine the concentration of Cl in mg/L, and the results are shown in the following table: Sample Method A Method B 1 0.39 0.36 0.84 1.35 3 1.76 2.56 4 3.35 3.92 4.69 5.35 7.70 8.33 7 10.52 10.70 8. 10.92 10.91 (a) What type of t test should be used to compare the two methods and why? (b) Do the two methods give different results? State and test the appropriate hypotheses. (c) Does the conclusion depend on whether the 90%, 95%, or 99% confidence levels are used?
2.2 (31) Virulence and pathogen transmission The number of new infections produced by an individual infected with a pathogen such as influenza depends on the mortality rate that the pathogen causes. This pathogen-induced mortality rate is referred to as the pathogen's virulence. (The photo shows victims at Camp Funston of the influenza epidemic of 1918.] Extremely high levels of virulence result in very little transmission because the infected individual dies before infecting other individuals. Under certain assumptions, the number of new infections N is related to virulence v by the function
5) Cobalt-60 is used in many common industrial applications and in radiotherapy in hospitals. Large sources of cobalt-60 are increasingly used for sterilization of spices and certain foods. The powerful gamma rays kill bacteria and other pathogens, without damaging the product. After the radiation ceases, the product is not left radioactive. This process is sometimes called "cold pasteurization. The following is the experimental data taken for Cobalt-60 Time (year) 2 70 Mass (g) And the model for radioactive decay is: •(†Ð)* m = m₂ Σ... - [(Σ.) (Σ.)]/n Σx² - (Σxi)²/n 6 45 b₁ = bo = ý – b c) Find mo and the half-life of this material 11 22 a) Linearize the proposed equation b) Find the equation of the regression line by least squares estimates 14 12 17 10 21 4
QUESTION 5 [9m] Nine experts rated two brands of Colombian coffee in a taste-testing experiment. A rating on a 7- point scale (1 = extremely unpleasing, 7 = extremely pleasing) is given for each of four characteristics: taste, aroma, richness, and acidity. The following data display the ratings accumulated over all four characteristics. Coffee SELF Test result: (a) At the 0.05 level of significance, is there evidence of a difference in the mean ratings between the two brands? (b) What assumption is necessary about the population distribution in order to perform this test? (c) Determine the p-value in (a) and interpret its meaning.

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