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Earth SUPPLEMENTAL EXERCISES - ESCI 103L - Cuyahoga Community College Water Quality - Accuracy and Precision Exer. 2 (1 p.) Name (Last, First) Adrian Fernandez ntroduction: A group of concerned citizens was worried that their local water supply might be contaminated with naturally occurring arsenic after seeing a map displayed showing they lived in an area of high arsenic concentrations. They decided to test water from 4 wells in their local area; each well was sampled and tested 4 different times. After analyzing the data (below), the citizens wrote a letter to the editor of a local newspaper arguing that their data proved that the water supply exceeded the maximum permitted level of arsenic in water supplies (10 micro-grams per liter). They demanded immediate government action to address the problem. The local water board tested the same water the same number of times and found average concentrations of 8.1 +/- 0.2 micrograms per liter (+/- refers to the "precision", or how much variability there is). Assume the water board's reported measurements are the true value ("accurate"). Sample 1 Sample 2 Sample 3 Sample 4 Average 14.0 7.0 8.0 18.0 10.0 23.0 5.0 7.0 21.0 Concentrations in micro-grams per liter Well 1 2 3 4 12.0 16.0 3.0 7.0 14.0 19.0 21.0 Average 10.3 14.5 12.5 14.0 12.8 1. Write a brief statement concerning accuracy and precision of the data reported by the concerned citizens. 2. What is the main hypothesis (general statement that they set out to test) that caused the citizens to collect the samples?

Earth SUPPLEMENTAL EXERCISES - ESCI 103L - Cuyahoga Community College Water Quality - Accuracy and Precision Exer. 2 (1 p.) Name (Last, First) Adrian Fernandez ntroduction: A group of concerned citizens was worried that their local water supply might be contaminated with naturally occurring arsenic after seeing a map displayed showing they lived in an area of high arsenic concentrations. They decided to test water from 4 wells in their local area; each well was sampled and tested 4 different times. After analyzing the data (below), the citizens wrote a letter to the editor of a local newspaper arguing that their data proved that the water supply exceeded the maximum permitted level of arsenic in water supplies (10 micro-grams per liter). They demanded immediate government action to address the problem. The local water board tested the same water the same number of times and found average concentrations of 8.1 +/- 0.2 micrograms per liter (+/- refers to the "precision", or how much variability there is). Assume the water board's reported measurements are the true value ("accurate"). Sample 1 Sample 2 Sample 3 Sample 4 Average 14.0 7.0 8.0 18.0 10.0 23.0 5.0 7.0 21.0 Concentrations in micro-grams per liter Well 1 2 3 4 12.0 16.0 3.0 7.0 14.0 19.0 21.0 Average 10.3 14.5 12.5 14.0 12.8 1. Write a brief statement concerning accuracy and precision of the data reported by the concerned citizens. 2. What is the main hypothesis (general statement that they set out to test) that caused the citizens to collect the samples?

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Earth SUPPLEMENTAL EXERCISES - ESCI 103L - Cuyahoga Community College Water Quality - Accuracy and Precision Exer. 2 (1 p.) Name (Last, First) Adrian ternandez ntroduction: A group of concerned citizens was worried that their local water supply might be contaminated with naturally occurring arsenic after seeing a map displayed showing they lived in an area of high arsenic concentrations. They decided to test water from 4 wells in their local area; each well was sampled and tested 4 different times. After analyzing the data (below), the citizens wrote a letter to the editor of a local newspaper arguing that their data proved that the water supply exceeded the maximum permitted level of arsenic in water supplies (10 micro-grams per liter). They demanded immediate government action to address the problem. The local water board tested the same water the same number of times and found average concentrations of 8.1 +/- 0.2 micrograms per liter (+/- refers to the "precision", or how much variability there is). Assume the water board's reported measurements are the true value ("accurate"). Sample 1 Sample 2 Sample 3 Sample 4 Average 12.0 14.0 7.0 8.0 16.0 18.0 10.0 14.0 23.0 5.0 19.0 7.0 21.0 21.0 Average Concentrations in micro-grams per liter Well 1 2 3 4 3.0 7.0 10.3 14.5 12.5 14.0 12.8 1. Write a brief statement concerning accuracy and precision of the data reported by the concerned citizens. The citizens decide to retest the water. 2. What is the main hypothesis (general statement that they set out to test) that caused the citizens to collect the samples?
Transcribed Image Text:Earth SUPPLEMENTAL EXERCISES - ESCI 103L - Cuyahoga Community College Water Quality - Accuracy and Precision Exer. 2 (1 p.) Name (Last, First) Adrian ternandez ntroduction: A group of concerned citizens was worried that their local water supply might be contaminated with naturally occurring arsenic after seeing a map displayed showing they lived in an area of high arsenic concentrations. They decided to test water from 4 wells in their local area; each well was sampled and tested 4 different times. After analyzing the data (below), the citizens wrote a letter to the editor of a local newspaper arguing that their data proved that the water supply exceeded the maximum permitted level of arsenic in water supplies (10 micro-grams per liter). They demanded immediate government action to address the problem. The local water board tested the same water the same number of times and found average concentrations of 8.1 +/- 0.2 micrograms per liter (+/- refers to the "precision", or how much variability there is). Assume the water board's reported measurements are the true value ("accurate"). Sample 1 Sample 2 Sample 3 Sample 4 Average 12.0 14.0 7.0 8.0 16.0 18.0 10.0 14.0 23.0 5.0 19.0 7.0 21.0 21.0 Average Concentrations in micro-grams per liter Well 1 2 3 4 3.0 7.0 10.3 14.5 12.5 14.0 12.8 1. Write a brief statement concerning accuracy and precision of the data reported by the concerned citizens. The citizens decide to retest the water. 2. What is the main hypothesis (general statement that they set out to test) that caused the citizens to collect the samples?
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