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A B C E F G Н Standard deviation (o) thousand dollars 2 3.9 given: 3 X Mean (x) -6.0 15.0 a) thousand dollars 4 4.4 8.1 5.06 6.1 -1.9 1.5 4.1 b) confidence level (c) 6 3.6 11.9 2.9 3.7 35 n 7 9.0 8.2 4.8 5.1 80 for 80% confidence level 1.282 8.3 6.4 -1.7 4.2 thousand dollars lower limit 9 5.5 4.7 9.4 4.21 thousand dollars 10 8.9 5.5 5.5 5.90 lupper limit 11 5.5 4.8 5.8 e) confidence level (c) 12 2.6 3.0 4.7 35 13 2.9 4.3 6.2 95 for 95% confidence level 14 1.960 lower limit 3.77 thousand dollars 15 thousand dollars 16 6.35 lupper limit LnO0o Ln CO O Ln LO LO

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