An object is weighed four times, and the results, in milligrams, are 234, 236, 233, and 229. The object is then weighed four times on a different scale, and the results, in milligrams, are 236, 225, 245, and 240. The average of all eight measurements will be used to estimate the weight. Someone suggests estimating the uncertainty in this estimate as follows: Compute the standard deviation of all eight measurements. Call this quantity s. The uncertainty is then 
Is this correct? Explain.
What will be an ideal response?
No, the 8 measurements are not a simple random sample from a single population. Instead, they consist of two random samples, each of size 4, from two different populations.
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A. ?rapid prototyping B. ?computer-aided flow analysis C. ?computer-aided design D. ?computer-aided engineering
When an aluminum foil is used in attic spaces, it is
A) laminated to fiberglass insulation. B) laminated to ceiling gypsum board. C) laminated to inside-facing surface of roof sheathing. D) sandwiched between ceiling gypsum board and fiberglass insulation. E) laminated to outside-facing surface of roof sheathing.
? Identify and state the historical significance of Joseph Lieberman.
What will be an ideal response?
The normal position for a suction service valve during normal operation is ____.
A. backseated B. frontseated C. cracked off the back D. midseated