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 (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 comes with a larger sample size. O X is more likely to be within 1 GPa of the mean in part (a). This is due to the decreased variability of X that comes with a smaller sample size. O X is more likely to be within 1 GPa of the mean in part (a). This is due to the increased variability of X that comes with a smaller sample size. 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 sample size.
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 (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 comes with a larger sample size. O X is more likely to be within 1 GPa of the mean in part (a). This is due to the decreased variability of X that comes with a smaller sample size. O X is more likely to be within 1 GPa of the mean in part (a). This is due to the increased variability of X that comes with a smaller sample size. 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 sample size.
Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.3: Special Probability Density Functions
Problem 30E
Related questions
Question
Transcribed Image Text: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 comes
with a larger sample size.
O X is more likely to be within 1 GPa of the mean in part (a). This is due to the decreased variability of X that comes
with a smaller sample size.
X is more likely to be within 1 GPa of the mean in part (a). This is due to the increased variability of X that comes
with a smaller sample size.
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 sample size.
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