Chemistry 9th Edition

Published by Cengage Learning
ISBN 10: 1133611095
ISBN 13: 978-1-13361-109-7

Chapter 1 - Chemical Foundations - Review Questions: 5

Answer

Conclusion about accuracy- Not accurate Conclusion about precision- Are precise

Work Step by Step

Results are not accurate as they are not close to the actual amount of calcium in the sample. Results are precise as they are close to each other. To establish this let us calculate the average of results- Average = $\frac{14.92 + 14.91 + 14.88 + 14.91}{4} $ Average = $\frac{59.62}{4} \approx 14.91 $ Thus results are close their average value, hence they are precise.
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