A 24.7-g sample of limestone, CaCO3, contains 9.88 g of calcium. What is the percent Ca in limestone?

Estimation from Sample Data • Margin of Error: for estimating the true mean of a population; this gives an interval of possible options around the estimated mean; this range of values can help us give a more accurate estimation of the mean o The margin of error at any degree of confidence is the amount that when added and subtracted to the true population mean will define a region that includes the middle x (degree of confidence) percentage of all possible values • This region of possible values is known as the confidence interval • When you hear ‘too close to call’, it means that the margins of error/confidence intervals are far too overlapping to make a decision about who will win • Margin of Error is