A series of 10 samples was taken at random from a site.The following results were obtained on the samples forlead.Using the above equations, calculate themagnitude of error that can be tolerated. (t at the 95%confidence interval for n-1 is 2.26)Sample 1 2 3 | 4 5 6 7 8 9 10Pb(x;), 91 | 95 104 82 95 103 97| 898589ppm93 93 9393 93 93| 93| 939393(mean)(x; – x) -2(x; – x)? 4211 -11 2 10 | 4-4-8-44 121 121 4 100 16166416If the level of precision obtained is notacceptable and a maximum error of 2 ppm isonly allowed, how many samples would needto be taken? (t at the 95% confidence intervalfor n = a is 1.96)

Sample standard deviation=∑xi-x¯2n-1=46610-1=7.1957 Margin of error=tα2*sn=2.26*7.195710=5.1426…

• A series of 10 samples was taken at random from a site. The following results were obtained on the samples for lead. Using the above equations, calculate the magnitude of error that can be tolerated. (t at the 95% confidence interval for n – 1 is 2.26) Sample 1 2 3 Pb(x,), 91 95 104 82 95 103 97 89 4 5 6 7 8 | 9 | 10 85 89 ppm 93 93 93 93 93 93 93| 93 93 93 (mean) (х — х) (x, – x)² 4 2 11 -11 2 10 4 4 121 121 4 100 16 16 -2 -4 -8 -4 64 16 If the level of precision obtained is not acceptable and a maximum error of 2 ppm is only allowed, how many samples would need to be taken? (t at the 95% confidence interval for n = a is 1.96)

• A series of 10 samples was taken at random from a site. The following results were obtained on the samples for lead. Using the above equations, calculate the magnitude of error that can be tolerated. (t at the 95% confidence interval for n – 1 is 2.26) Sample 1 2 3 Pb(x,), 91 95 104 82 95 103 97 89 4 5 6 7 8 | 9 | 10 85 89 ppm 93 93 93 93 93 93 93| 93 93 93 (mean) (х — х) (x, – x)² 4 2 11 -11 2 10 4 4 121 121 4 100 16 16 -2 -4 -8 -4 64 16 If the level of precision obtained is not acceptable and a maximum error of 2 ppm is only allowed, how many samples would need to be taken? (t at the 95% confidence interval for n = a is 1.96)

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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