The article "The Lubrication of Metal-on-Metal Total Hip Joints: A Slide Down theStribeck Curve" (S. Smith, D. Dowson, and A. Goldsmith, Proceedings of the Institution ofMechanical Engineers, 2001:483-493) presents results from wear tests done on"metal artificial hip joints. Joints with several different diameters were tested. The datapresented in the following table on head roughness are consistent with the means andstandard deviations reported in the article.Diameter (mm)Head Roughness (nm)160.832.250.202.78 3.93282.722.483.80365.995.324.59Construct an ANOVA table. You may give a range for the P-value.b. Can you conclude that mean roughness varies with diameter? Explain.a.

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Answered: The article "The Lubrication of…

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 “Influence of Penetration Rate on Penetrometer Resistance” (J. Oliveira, M. Almeida, et al., Journal of Geotechnical and Geoenvironmental Engineering, 2011:695– 703) presents measures of penetration resistance for a certain fine-grained soil. Fifteen measurements, expressed as a multiple of a standard quantity, had a mean of 2.64 and a standard deviation of 1.02. Find a 95% confidence interval for the mean penetration resistance for this soil.
5.17 Paired or not, Part I?: In each of the following scenarios, determine if the data are paired.(a) Compare pre- (beginning of semester) and post-test (end of semester) scores of students. ( ) not paired ( ) paired (b) Assess gender-related salary gap by comparing salaries of randomly sampled men and women. ( ) paired ( ) not paired (c) Compare artery thicknesses at the beginning of a study and after 2 years of taking Vitamin E for the same group of patients. ( ) not paired ( ) paired
The processing of raw coal involves “washing,” in which coal ash (nonorganic, incombustible material) is removed. The article “Quantifying Sampling Precision for Coal Ash Using Gy’s Discrete Model of the Fundamental Error” (Journal of Coal Quality, 1989:33–39) provides data relating the percentage of ash to the volume of a coal particle. The average percentage of ash for six volumes of coal particles was measured. The data are as follows: Volume (cm3) 0.01 0.06 0.58 2.24 15.55 276.02 Percent ash 3.32 4.05 5.69 7.06 8.17 9.36 Using the most appropriate model, predict the percent ash for particles with a volume of 48 cm3. Round answer to three decimal places.
The article “Some Parameters of the Population Biology of Spotted Flounder (Ciutharus linguatula Linnaeus, 1758) in Edremit Bay (North Aegean Sea)” (D. Türker, B. Bayhan, et al., Turkish Journal of Veterinary and Animal Science, 2005:1013–1018) reports that a sample of 482 female spotted flounder had an average weight of 20.95 g with a standard deviation of 14.5 g, and a sample of 614 male spotted flounder had an average weight of 22.79 g with a standard deviation of 15.6 g. Can you conclude that the mean weight of male spotted flounder is greater than that of females?
The article “Occurrence and Distribution of Ammoniumin Iowa Groundwater” (K. Schilling, WaterEnvironment Research, 2002:177–186) describesmeasurements of ammonium concentrations (inmg/L) at a large number of wells in the state of Iowa.These included 349 alluvial wells and 143 quaternarywells. The concentrations at the alluvial wells averaged0.27 with a standard deviation of 0.40, and thoseat the quaternary wells averaged 1.62 with a standarddeviation of 1.70. Find a 95% confidence interval forthe difference in mean concentrations between alluvialand quaternary wells.
Tensile strength tests were carried out on two different grades of wire rod, resulting in the following data: Grade Sample size Sample mean Sample (kg/mm?) Stdev AISI 1064 129 105.2 1.3 AISI 1078 129 121.4 2.0 Does the data provide compelling evidence for concluding that true average strength for the 1078 grade exceeds that for the 1064 grade by more than 10 kg/mm2? Test the appropriate hypotheses using the P-value approach. Estimate the difference between true average strengths for thetwo grades in a way that provides information about precision and reliability. How does this compare to the result using the hypothesis test?
Green Sea Urchins. From the paper “Effects of Chronic Nitrate Exposure on Gonad Growth in Green Sea Urchin Strongylocentrotus droebachiensis” (Aquaculture, Vol. 242, No. 1–4, pp. 357– 363) by S. Siikavuopio et al., we found that weights of adult green sea urchins are normally distributed with mean 52.0 g and standard deviation 17.2 g. a. Find the percentage of adult green sea urchins with weights between 50 g and 60 g. b. Obtain the percentage of adult green sea urchins with weights above 40 g. c. Determine and interpret the 90th percentile for the weights. d. Find and interpret the 6th decile for the weights.
A survey found that women's heights are normally distributed with mean 63.1 in. and standard deviation 3.4 in. The survey also found that men's heights are normally distributed with mean 69.4 in. and standard deviation 3.7 in. Most of the live characters employed at an amusement park have height requirements of a minimum of 56 in. and a maximum of 62 in. Complete parts (a) and (b) below. (...) a. Find the percentage of men meeting the height requirement. What does the result suggest about the genders of the people who are employed as characters at the amusement park? The percentage of men who meet the height requirement is%. (Round to two decimal places as needed.)

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