The article “Magma Interaction Processes Inferred from Fe-Ti Oxide Compositions in the Dölek and Sariçiçek Plutons, Eastern Turkey” (O. Karsli, F. Aydin, et al., Turkish Journal of Earth Sciences, 2008:297–315) presents chemical compositions (in weight-percent) for several rock specimens. Fourteen specimens (two outliers were removed) of limenite grain had an average iron oxide (Fe2O3) content of 9.30 with a standard deviation of 2.71, and seven specimens of limenite lamella had an average iron oxide content of 9.47 with a standard deviation of 2.22. Can you conclude that the mean iron oxide content differs between limenite grain and limenite lamella?

Young's modulus is a quantitative measure of stiffness of an elastic material. Suppose that for aluminum alloy sheets of a particular type, its mean value and standard deviation are 70 GPa and 1.6 GPa, respectively (values given in the article "Influence of Material Properties Variability on Springback and Thinning in Sheet Stamping Processes: A Stochastic Analysis" (Intl. J. of Advanced Manuf. Tech., 2010: 117-134)). (a) If X is the sample mean Young's modulus for a random sample of n = 16 sheets, where is the sampling distribution of X centered, and what is the standard deviation of the X distribution? E(X) = GPa GPa x = (b) Answer the questions posed in part (a) for a sample size of n = 64 sheets. E(X) GPa GPa ox = (c) For which of the two random samples, the one of part (a) or the one of part (b), is X more likely to be within 1 GPa of 70 GPa? Explain your reasoning. O X is more likely to be within 1 GPa of the mean in part (b). This is due to the decreased variability of X that…

Young's modulus is a quantitative measure of stiffness of an elastic material. Suppose that for aluminum alloy sheets of a particular type, its mean value and standard deviation are 70 GPa and 1.6 GPa, respectively (values given in the article "Influence of Material Properties Variability on Springback and Thinning in Sheet Stamping Processes: A Stochastic Analysis" (Intl. J. of Advanced Manuf. Tech., 2010: 117-134)). | If X is the sample mean Young's modulus for a random sample of n = 64 sheets, where is the sampling distribution of X centered, and what is the standard deviation of the X distribution? EX) = GPa GPa J Answer the questions posed in part (a) for a sample size of n = 256 sheets. E(X) = GPa GPa For which of the two random samples, the one part (a) or the one of part (b), is X more likely to be within 1 GPa of 70 GPa? Explain your reasoning. O X is more likely to be within 1 GPa of the mean in part (b). This is due to the increased variability of X that comes with a larger…

The following are the rates of diffusion of carbon dioxide through two soils of different porosity. Fine Soil: 20, 31, 18, 23, 23, 28, 23, 26, 27, 26, 12, 17, 25 Course Soil: 19, 30, 32, 28, 15, 26, 35, 18, 25, 27, 35, 35. Estimate the difference, in the two rates, as a 95% confidence interval, a) by assuming equal variability, b) by assuming unequal variability.

2. In a lab experiment, students estim is known to have a true value of 5% weight by volume, but students' results are known to follow approximately a normal distribution with a standard deviation of 0.09 percentage points. ate the concentration of an unknown salt in solution. The solution A) Assuming that the student measurements are unbiased and independent, what proportion of students will obtain a concentration estimate greater than 506%? 2-х-М -0.05004 np ICo.oso) 16S Assuming that the student measurements are unbiased and independent, what proportion of of 20 students will obtain a sample mean concentration estimate greater than 5.06%? classes 20-4 o.o 20 20 C ts Circle the name of a plot that could be used to display the distribution of the concentrations obtained by the class of 20 students (circle only one answer, though more may be correct): time plot pie chart stem plot histogram ar plot

Young's modulus is a quantitative measure of stiffness of an elastic material. Suppose that for aluminum alloy sheets of a particular type, its mean value and standard deviation are 70 GPa and 1.6 GPa, respectively (values given in the article "Influence of Material Properties Variability on Springback and Thinning in Sheet Stamping Processes: A Stochastic Analysis" (Intl. J. of Advanced Manuf. Tech., 2010: 117–134)). (a) If X is the sample mean Young's modulus for a random sample of  n = 64  sheets, where is the sampling distribution of X centered, and what is the standard deviation of the X distribution? E(X)  =   GPa ? X  =   GPa (b) Answer the questions posed in part (a) for a sample size of  n = 256  sheets. E(X)  =   GPa ? X  =   GPa

Fission tracks are trails found in uranium-bearing minerals, left by fragments released during fission events. The article “Yo-yo Tectonics of the Niğde Massif During Wrenching in Central Anatolia” (D. Whitney, P. Umhoefer, et al., Turkish Journal of Earth Sciences, 2008:209–217) reports that fifteen tracks on one rock specimen had an average track length of 13 μm with a standard deviation of 2 μm. Assuming this to be a random sample from an approximately normal population, find a 99% confidence interval for the mean track length for this rock specimen.