2. A study was conducted to determine the level of cyanide in 20 exposed spot (soil and water)within the mine site are listed below:SpotSoilWaterSpotSoilWater12.54.9111.84.26.97.0121.81.133.15.9136.010.03.32.91420.011.02.14.4153.05.54.64.6162.02.573.56.91736.041.081.61.4182.52.393.17.0194.74.4107.27.7204.12.5a. What is the value of the point estimate?b. Find a 95% confidence interval for the mean difference, where mean1 and mean2 representthe true mean level of cyanide in water and soil, respectively. Assume the distribution of thedifferences to be approximately normal.С.Test the hypothesis that the mean level of cyanide in water is greater than in soil at 0.025level of significance.d.Test the hypothesis that the variances are equal at 0.1 level of significance.

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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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4. A Warranty data for an automobile component is shown below: # failures # of Censored # vehicles Mileage within band Δη, beginning of interval h, Pi R. within band i+1 0-2 400 200000 2--4 200 199600 4--6 150 5 199400 6--8 120 15 199245 8--10 110 150 199110 10--12 105 800 198850 12--14 120 2000 197945 14--16 85 3500 195825 16--18 90 6000 192240 18--20 78 8000 186150 20--22 90 10300 178072 22--24 68 12000 167682 24--26 58 13000 155614 26--28 50 13500 142556 28--30 59 13000 129006 30--32 56 12000 115947 32--34 55 11800 103891 34--36 80 11500 92036 >36 80456 80456 Totals 198026 Estimate reliability at the end of 12K, 24K, and 36K miles
3. Exercise 15.38. Cooking vegetables in different pots. Let's first concentrate on the 12 observations for the vegetable dish. Does the vegetable dish vary in iron content when cooked in aluminum, clay, and iron pots? Pot Rep Dish Aluminum 1 Aluminum 2 Aluminum 3 Aluminum 4 1 Clay Clay Clay Clay Iron Iron Iron Iron 3 4 Iron content vegetable 1.03 vegetable 1.53 vegetable 1.07 vegetable 1.30 vegetable 1.55 vegetable 0.79 vegetable 1.68 vegetable 3.52 vegetable 2.45 vegetable 2.99 vegetable 2.80 vegetable 2.92 (a) Check the conditions for one-way ANOVA. Which requirements are a bit dubious in this setting? (b) Instead of using ANOVA, using a nonparametric method. Summarize your conclusions about the effect of pot material on the iron content of the vegetable dish.
7. Did plant height of the Alpine ecotype of cinquefoil vary between gardens? Provide justification for your answer including appropriate screenshots of text output and figures from R. The height of the Alpine ecotype cinquefoil does vary. Week 1 Assignment: Characterizing Populations > Ichistan; uchstan # Stanford garden [1] 25.78633 [1] 31.30598 Ich math; ucmath # Mather garden [1] 41.35308 [1] 48.65359 >chtimb; ultimb # Timberline garden [1] 23.81529 [1] 29.17042 Environment History Connections Tutorial Import Dataset ▾ 61 MiB List▾ Global Environment n.stan n. timb s.math 26L 28L 9.61125358120879 s.stan 6.70010332870954 s.timb 6.78079688157715 $1 17.3924278891305 $2 6 $3 97 54 $5 30.15 53 uc1.math uc1.stan ucl. timb x y1 y2 уз Functions 48.6535875829896 31.3059780687354 29.170424087752 ... num [1:141] 20 20.2 20.5 20.8 21 num [1:141] 1.98e-10 6.70e-10 2.19e... num [1:141] 1.86e-45 1.40e-44 1.04e... num [1:141] 8.29e-07 2.19e-06 5.55e... Height in cm 10 20 30 40 50 60 60 Mather…
2.3.1 Which is the highest level of measurement possible for each of the following variables? a. Daily high temperature for a given year in Chicago b. Marital status of the applicants for a particular job c. Class standings at a university (freshman, sophomore, etc.) d. Colors of roses e. Weights of all American-made cars f. Number in attendance per day at a particular high school g. Birthdays of people in a certain group
10. The following data was collected from 1 bag of Hershey Kisses®. Each Kiss® was weighed in grams with the wrapper and recorded in the table below. Hershey cims that there are 368 grams of chocolate in one bag. Hershey Kiss Weights in Grams 4.76 4.72 4.74 4.55 4.91 4.74 4.78 4.71 4.80 4.78 4.78 4.75 4.79 4.82 4.91 4.83 4.68 4.74 4.70 4.80 4.70 4.76 4.70 4.83 4.93 4.74 4.84 4.82 4.76 4.77 4.72 4.78 4.83 4.75 4.74 4.68 4.84 4.71 4.71 4.76 4.66 4.78 4.73 4.74 4.92 4.77 4.80 4.79 4.86 4.64 4.78 4.70 4.75 4.78 4.76 4.83 4.66 4.77 4.83 4.78 4.69 4.81 4.68 4.78 4.88 4.72 4.85 4.85 4.81 4.74 4.80 4.82 4.84 4.70 4.85 4.70 4.81 4.72 4.79 4.73 4.61 How might standard deviation and the shape of the distribution indicate how consistent Hershey® is in the manufacturing of their Kisses®?
Following are measurements of soil concentrations (in mg /kg) of chromium (Cr) and nickel (Ni) at20 sites in the area of Cleveland, Ohio. These data are taken from the article "Variation in NorthAmerican Regulatory Guidance for Heavy Metal Surface Soil Contamination at Commercial andIndustrial Sites" (A. Jennings and J. Ma, J. Environment Eng, 2007:587-609). Cr: 260 19 36 247 263 319 317 277 319 264 23 29 61 119 33 281 21 35 64 30Ni: 435 377 359 53 38 38 54 188 397 33 92 490 28 35 799 347 321 32 74 508 (a) Construct a histogram for each set of concentrations. (b) Find the 1st, 2nd and 3rd quartiles for the Cr concentrations (c) Find the 1st, 2nd and 3rd quartiles for the Ni concentrations.
10. In order to stndy the output of a machine that fils boxes with certal, a quality control engineer Swmighed 150 boxes of Brand X cereal. The frequen- cy distribetion in Figure 4..20 summarizes her find- ings. Construct a histogram to represent the data. I- Weight (in ounces) Number of Bares 15.3 SI<15.6 13 15.6 sx<15.9 24 15.9 SI<16.2 84 16.2 SI<16.5 19 16.5sx<16.8 10 FIGUSE 4 n

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