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fb4_44

# fb4_44 - f t PROBLEM 4.44 KNOWN N1 = 60 3x1 = 1.5257 CI.=...

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Unformatted text preview: f t PROBLEM 4.44 KNOWN: N1 = 60 3x1 = 1.5257 CI .= 0.28 FIND: NT ASSUMPTIONS: 95% conﬁdence required. 3x1 is representative of a. SOLUTION With N1 = 60, v = 59 and t59,95 = 2.00. Setting d = CI/Z = 0.14, then NT = (thl/d)2 = [(2)(1.52)/0.14]2 = 472 As a ﬁrst estimate, at least 472 total measurements will be needed to achieve the desired precision levels. Hence, another 412 measurements are needed. PROBLEM 4.45 FIND: P(x2(10) > 19.0) SOLUTION From Table 4.5: 0.05 521.1200) 5 0.025 that is, the probability lies between 2.5 and 5%. 4—43 ...
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