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Kreyszig Advanced Engineering Mathematics 9 solution manual.pdf


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9/21/05

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Instructor’s Manual

we get c 2.62. From the sample we compute
36.2 35.0
t 15
4.90 c
0.9

and reject the hypothesis.
38. The hypothesis is 0 1000, the alternative 1000. Because of the symmetry of
the t-distribution, from Table A9 with 19 degrees of freedom we get for this
two-sided test and the percentages 2.5% and 97.5% the critical values 2.09. From
the sample we compute
t 20
(991 1000)/8 5.03 c 2.09
and reject the hypothesis.
40. 2.58 • 0.0002
4 / 2 0.028, LCL 2.722, UCL 2.778
42. 2.58 0.0004
/ 2 0.036, UCL 3.536, LCL 3.464
44. P(T
3) 6.8% (Table A12). No.