Confidence interval for the variance of the heights
Find the 95% confidence interval for the variance of the heights of maple trees if a sample of 21 trees has a standard deviation of 8.2 feet.
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A point source is located 25 cm from the surface of a cylindrical detector along the cylindrical axis. The subtended solid angle for this geometry is 0.15 steradians. What is the radius of the detector?
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