SOLUTION: A study of one-millimeter crystal marbles used in making crystal chandeliers showed
that the standard deviation of the weight a crystal marble is 250 milligrams. A crystal
chande
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that the standard deviation of the weight a crystal marble is 250 milligrams. A crystal
chande
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Question 462607: A study of one-millimeter crystal marbles used in making crystal chandeliers showed
that the standard deviation of the weight a crystal marble is 250 milligrams. A crystal
chandelier manufacturer wishes to find the 90% confidence interval for the average
weight of a one-millimeter crystal marble. How many crystal marbles does she need to
weigh to be accurate within 15 milligrams Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! A study of one-millimeter crystal marbles used in making crystal chandeliers showed that the standard deviation of the weight a crystal marble is 250 milligrams.
A crystal chandelier manufacturer wishes to find the 90% confidence interval for the average weight of a one-millimeter crystal marble.
How many crystal marbles does she need to weigh to be accurate within 15 milligrams
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n = [z*s/E]^2
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n = [1.645*250/15]^2 = 752 when rounded up
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Cheers,
Stan H.
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