A student determines the concentration of an unknown sample using two different methods. Each method has three different trials; the average, standard deviation and percent error produced by each method is listed below. Method 1 Average: 10.56 M NaOH Standard deviation: 1.35 M NaOH Percent error: 1.25% Method 2 Average: 10.92 M NaOH Standard deviation: 1.02 M NaOH Percent error: 3.45% Which method was more precise? How can you tell?
A student determines the concentration of an unknown sample using two different methods. Each method has three different trials; the average, standard deviation and percent error produced by each method is listed below. Method 1 Average: 10.56 M NaOH Standard deviation: 1.35 M NaOH Percent error: 1.25% Method 2 Average: 10.92 M NaOH Standard deviation: 1.02 M NaOH Percent error: 3.45% Which method was more precise? How can you tell?
Chapter6: Random Errors In Chemical Analysis
Section: Chapter Questions
Problem 6.19QAP
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A student determines the concentration of an unknown sample using two different methods. Each method has three different trials; the average, standard deviation and percent error produced by each method is listed below.
Method 1
Average: 10.56 M NaOH
Standard deviation: 1.35 M NaOH
Percent error: 1.25%
Method 2
Average: 10.92 M NaOH
Standard deviation: 1.02 M NaOH
Percent error: 3.45%
Which method was more precise? How can you tell?
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