Calcium The calcium (Ca) content of a powdered mineral substance was analysed 10 tim...

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

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?