Answers to Problems of the A Groups
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4. (a) 0.35%, 3.5 ppt
(b) 0.35%, 3.5 ppt
(c) 0.039%, 0.39 ppt
(d) 0.59%, 5.9 ppt
(e) 0.002%, 0.02 ppt
(f) 0.87%, 8.7 ppt
(g) 0.35%, 3.5 ppt
5. Av dev = 5.0, and 5 = 5.9
90% confidence interval for a single value = 2643 ± 11.2
90% confidence interval for the mean = 2643 ± 4.0
6. Av dev = 0.0039
95% confidence interval for a single value = 5.020 ± 0.011
7. Av dev = 0.10%
70% confidence limits for a single value = ±0.15%
8. Av dev = 3.7 ppt
99% confidence limits for the mean = ±4.2 ppt
9. Av dev = 2.9 ppt
80% confidence limits for the mean = ±2.4 ppt
10. d = 0.997 g/ml
y = 72.0 dynes/cm
11. 4 grams or more
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CHAPTER 6
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