Help 16.21topsoil for four different soil treatments appeared in thearticle "Fertilisers for Lotus and Clover Establishmentson a Sequence of Add Soils on the East Otago Up-lands" (New Zealand Journal of Experimental Agricul-ture [1984]: 119-129). Use the KW test and a .01significance level to test the null hypothesis of no differ-ence in true mean phosphorus concentration for the foursoil treatments.The given data on phosphorus concentration inBold exercises answered in backData set available online1 TreatmentConcentration (mg/g)I8.15.97.08.09.01II11.510.912.110.311.9III15.317.416.415.816.0IV23.033.028.424.627.7

Steps to Solve:Set Up Hypotheses:Null Hypothesis (H0): There is no difference in the median…

Answered: 16.21 topsoil for four different soil…

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 yield of alfalfa from a random sample of six test plots is 1.4, 1.6, 0.9, 1.9, 2.2,and 1.2 tons per acre. Assume the data can be looked upon as a sample from anormal population. Test at the 0.05 level of significance whether this supports thecontention that the average yield for this kind of alfalfa is 1.5 tones per acre.
The article “Arsenic and Mercury in Lake Whitefish and Burbot Near the Abandoned Giant Mine on Great Slave Lake” (P. Cott, B. Zajdlik, et al., Journal of Great Lakes Research, 2016:223–232) presents measurements of arsenic concentrations in fish found in Northern Canada. In a sample of 8 whitefish caught in Yellowknife Bay, the mean arsenic concentration in the liver was 0.32 mg/kg, with a standard deviation of 0.05 mg/kg. Can you conclude that the mean arsenic concentration in whitefish in Yellowknife Bay is greater than 0.3 mg/kg?
Because of high production-changeover time and costs, a director of manufacturing must convince management that a proposed manufacturing method reduces costs before the new method can be implemented. The current production method operates with a mean cost of $220 per hour. A research study will measure the cost of the new method over a sample production period. Write out the null and alternative hypotheses most appropriate for this study. Н.: Н
The degenerative disease osteoarthritis most frequently affects weight-bearing joints such as knee. The article “Evidence of Mechanical Load Redistribution at the Knee Joint in the Elderly when Ascending Stairs and Ramps” (Annals of Biomed. Engr., 2008:467-476) presented the following summary data on stance duration (ms) for samples of both older and younger adults. Age Sample Size Sample Mean Sample SD Older 28 801 117 Younger 16 780 72 Assume that both stance duration distributions are normal. Carry out a test of hypotheses at significance level .05 to decide whether true average stance duration is larger among elderly individuals than among younger individuals. (Population variances are not assumed equal.)
(1) Two rubber compounds were tested for tensile strength and the fol- lowing values were found A : 32,30,33, 32, 29, 34, 32 B: 33,35, 36, 37,35, 34 Under the assumption that the two populations are normally distributed, test the hypothesis that the average tensile strength of the two rubber compounds is different using significance level a = 0.01 and a = 0.05.
7. Maternal role adaptation was compared in a group of mothers of low birth-weight (LBW) infants who had been in an experimental intervention, mothers of LBW infants who were in a control group, and mothers of full-term infants. Using SPSS, researchers performed an ANOVA to see if there is a difference in adaptation between the groups. They got the following results: Adapt LBW-Exp LBW-Control Full-Term Total Adapt Adapt LSD Between Groups Within Groups Total (1) Group LBW-Exp LBW-Control N Full-Term 29 27 37 93 (J) Group LBW-Control Full-Termi LBW-Exp Full-Term LBW-Exp LBW-Control Mean Std. Deviation 14.97 4.844 18.33 5.166 14.84 3.708 15.89 4.747 Sum of Squares 226.932 1845.993 2072.925 Mean Difference (1- -3.368 .128 3.368 3.495 Descriptives Std. Error .899 .994 .610 492 Multiple Comparisons -.128 -3.495* *. The mean difference is significant at the 0.05 level. ANOVA df Std. Error 1.211 1.123 1.211 1.146 1.123 1.146 2 90 92 95% Confidence Interval for Mean Lower Bound Upper Bound…
Because of high production-changeover time and costs, a director of manufacturing must convince management that a proposed manufacturing method reduces costs before the new method can be implemented. The current production method operates with a mean cost of $260 per hour. A research study will measure the cost of the new method over a sample production period. (a) Develop the null and alternative hypotheses most appropriate for this study. Ho: H 260 Hai us 260 Ho: Hs 260 Ha: H > 260 Ho:H2 260 H: u < 260 Ho: H = 260 H: µ # 260 (b) Comment on the conclusion when H, cannot be rejected. There is not enough evi to conclude that the new method reduces costs. Management should consider implementing the new O There is not enough evidence to conclude that the new method reduces costs. Management should not consider implementing the new method. O There is enough evidence to conclude that the new method reduces costs. Management should not consider implementing the new method. There is enough…
1. A textile company is interested in knowing if there is a difference in the breaking strength offour different kinds of thread. A test was conducted where five measurements (in ounces) weretaken for each kind of thread. Dummy variables were created named threada, threadb, andthreadc, which indicated if a strength reading was obtained on thread a, b, or c, respectively. Aregression analysis was performed with breaking strength as the dependent variable and threada,threadb, and threadc as independent variables, the results are attached at the end of the sheet. a) Write the linear model for the regression analysis, give the F statistic and P valuefor the test of equality of breaking strength means for the four threads, and state your conclusionfor the test using alpha = .05. b) Use the printout from the regression analysis to give estimates of the mean breakingstrength for each of the four thread groups. c) On the regression analysis printout on the row with information about threadb…
An experiment was conducted to determine the effect of machining factors on ceramicstrength. Two levels of table speed (slow and fast), two directions (longitudinal and transverse) and two levelsof wheel grit (I and II) were identified by the researcher. The experiment was replicated three times and thestrength of each randomly selected ceramic was obtained. The ANOVA table of the results of the analysis areas follows. 1. Refer to the ANOVA table at a=0.01, what is the conclusion for testing significance in 3-way interaction Reject/Fail to Reject Ho 2. If sequential test of hypothesis is performed the following are (True or False)? a. All 2-way interaction effects are going to be tested b. All main effects are going to be tested 3. What combination of effects will result to a significant result at a=0.01 if should all test are going to be performed among the main effects and two way interactions? (choose 1pair/combination: direction, wheel grit, speed)
5.6.5 WP An article in Knee Surgery Sports Traumatology, Arthroscopy ["Effect of Provider Volume on Resource Utilization for Surgical Procedures" (2005, Vol. 13, pp. 273–279)] showed a mean time of 129 minutes and a standard deviation of 14 min- utes for ACL reconstruction surgery for high-volume hospitals (with more than 300 such surgeries per year). If a high-volume hospital needs to schedule 10 surgeries, what are the mean and variance of the total time to complete these surgeries? Assume that the times of the surgeries are independent and normally distributed.
Blood cocaine concentration (mg/L) was determinedboth for a sample of individuals who had died fromcocaine-induced excited delirium (ED) and for a sampleof those who had died from a cocaine overdose withoutexcited delirium; survival time for people in bothgroups was at most 6 hours. The accompanying datawas read from a comparative boxplot in the article“Fatal Excited Delirium Following Cocaine Use” (J.of Forensic Sciences, 1997: 25–31). ED 0 0 0 0 .1 .1 .1 .1 .2 .2 .3 .3.3 .4 .5 .7 .8 1.0 1.5 2.7 2.83.5 4.0 8.9 9.2 11.7 21.0Non-ED 0 0 0 0 0 .1 .1 .1 .1 .2 .2 .2.3 .3 .3 .4 .5 .5 .6 .8 .9 1.01.2 1.4 1.5 1.7 2.0 3.2 3.5 4.14.3 4.8 5.0 5.6 5.9 6.0 6.4 7.98.3 8.7 9.1 9.6 9.9 11.0 11.512.2 12.7 14.0 16.6 17.8 a. Determine the medians, fourths, and fourth spreadsfor the two samples.b. Are there any outliers in either sample? Any extremeoutliers?c. Construct a comparative boxplot, and use it as abasis for comparing and contrasting the ED andnon-ED samples.
An experiment to compare the spreading rates of five different brands of yellow interior latex paint available in a particular area used 4 gallons (J = 4) of each paint. Suppose that all require assumptions are satisfied. The sample average spreading rates (ft-/gal) for the five brands were x1 = 462.0, X2. = 512.8, x3 = 437.5, x4. 469.3, and X5. = 532.1. The computed value found to be significant at level a = 0.05. With MSE 220.8, use Tukey's procedure to investigate significant differences between brands. (Round your answer to two decimal places.) %3D W = Which means differ significantly from one another? (Select all that apply.). and

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