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The calcium ca content of a powdered mineral substance was

The calcium (Ca) content of a powdered mineral substance was analyzed 10 times with the following percent compositions recorded:

0.0271 0.0282 0.0279 0.0281 0.0268

0.0271 0.0281 0.0269 0.0275 0.0276

a. Find a 99% confidence interval for the true calcium content of this substance.

b. What does the phrase "99% confident" mean?

c. What assumptions must you make about the sampling procedure so that this confidence interval will be valid? What does this mean to the chemist who is performing the analysis?

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Basic Statistics: The calcium ca content of a powdered mineral substance was

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