Four research teams measured the density of a new alloy, and what each team wrote in its team notebook is shown in the table below. Suppose a later and more reliable measurement gives 7.70 g/cm° for the density of the same alloy. Decide which of the earlier measurements was the most accurate, and which was the most precise.
Four research teams measured the density of a new alloy, and what each team wrote in its team notebook is shown in the table below. Suppose a later and more reliable measurement gives 7.70 g/cm° for the density of the same alloy. Decide which of the earlier measurements was the most accurate, and which was the most precise.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Transcribed Image Text:**Title: Analyzing Measurement Accuracy and Precision for Alloy Density**
Four research teams measured the density of a new alloy, and their recorded observations are presented in the table below.
**Objective:**
Determine which of the earlier measurements by the teams was the most accurate and which was the most precise, given a later and more reliable density measurement of 7.70 g/cm³.
**Table: Team Measurements of Alloy Density**
| Team | What Was Written in the Notebook | Most Accurate Measurement | Most Precise Measurement |
|------|----------------------------------|---------------------------|--------------------------|
| A | “between 7.75 g/cm³ and 7.85 g/cm³” | | |
| B | “7.72 g/cm³ ± 0.02 g/cm³” | | |
| C | “7.6 g/cm³” | | |
| D | “7.50 g/cm³ ± 0.10%” | | |
**Instructions:**
- Select the most accurate measurement by comparing how close each team's data is to the reliable measurement of 7.70 g/cm³.
- Determine the most precise measurement by assessing the spread or variation in the recorded data by each team.
**Considerations:**
- Accuracy refers to how close a measurement is to the true or accepted value.
- Precision reflects how reproducible the measurement is, regardless of its closeness to the true value.
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