Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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How many electrons are transferred in the half-reaction H2AlO3 (aq) + H2­O (l) → Al (s) + 4 OH– (aq)?

   

3 electrons are lost by Al

   

1 electron is gained by O

   

1 electron is lost by O

   

3 electrons are gained by Al

Measuring the amount of fluoride in five samples of toothpaste gave the following results: 0.77, 0.46, 0.56, 0.22, and 0.49 mg/sample. The average
amount of fluorine for these samples is 0.50 mg, with a standard deviation of 0.20 mg/sample. Can any data points be rejected at a 95% confidence
level?
Critical values for outlier tests
(G)
Gerit value
Number of
observations
4
1.463
1.672
1,822
1.938
5
7
Yes, 0.56 mg can be rejected as an outlier
No, none of the values can be rejected.
O Yes, 0.22 mg can be rejected as an outlier
Yes, 0.77 mg can be rejected as an outlier
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Transcribed Image Text:Measuring the amount of fluoride in five samples of toothpaste gave the following results: 0.77, 0.46, 0.56, 0.22, and 0.49 mg/sample. The average amount of fluorine for these samples is 0.50 mg, with a standard deviation of 0.20 mg/sample. Can any data points be rejected at a 95% confidence level? Critical values for outlier tests (G) Gerit value Number of observations 4 1.463 1.672 1,822 1.938 5 7 Yes, 0.56 mg can be rejected as an outlier No, none of the values can be rejected. O Yes, 0.22 mg can be rejected as an outlier Yes, 0.77 mg can be rejected as an outlier
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