Calcium The calcium (Ca) content of a powdered mineral substance was analyzed 10 times with the following percent compositions
.0271 | .0282 | .0279 | .0281 | .0268 |
.0271 | .0281 | .0269 | .0275 | .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? recorded:
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