Exam1Sp02AKey

Exam1Sp02AKey - the book. 3.86>2.763,...

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Spring 2002 Exam 1 Solutions MSCI3710 No. Solution Version A 1 The correct set of hypothesis for this test is Ho: μ = 7500 Ha: μ 7500 C 2 When population standard deviation is known and the sample size is large, use Z test C 3 Z= (X- μ )/( σ / n)=(7750-7500)/(975 / 36) = 1.54 B 4 Z (alpha/2)=1.96. Because this is the two-tail test. The reject area should be to the left of Z=-1.96, and to the right of Z=1.96 D 5 Z*=1.60 < Z (alpha/2)=1.96, so Fail to reject Ho, which means the average is equal to $7500 A 6 If Z* = 1.96, p=0.0255*2=0.05 B 7 The correct set of hypothesis for this test is Ho: μ < 200 Ha: μ >1200 D 8 Z= (X- μ )/(s/ n)=(210.66-200)/(35.2 / 20) = 1.35 B 9 1.328 < T* (alpha, 19) = 1.40 <1.729. We can get .05 <p< .1 B 10 Because P=.07 < alpha=.1, Reject Ho. So μ > 200 A 11 S p 2 = (n1-1) S 1 2 + (n2-1) S 2 2 = 15*(4.4 2 ) + 13*(3.3 2 ) = 15.4 n 1 + n 2 – 2 28 B 12 T (alpha/2, df)= t (.025,28) = 2.048 C 13 t = X 1 - X 2 = 27.4-23.5 = 2.52 S p * 1/n 1 + 1/n 2 4.24 * 1/16+ 1/14 D 14 T (p/2, df)=3.86, df=n1+n2-2=28. Look at the table in the front of
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Unformatted text preview: the book. 3.86&gt;2.763, p&lt;.005*2=.01 E 15 The correct set of hypothesis for this test is Ho: p 0.60 Ha: p&lt;0.60 C 16 Z = p(het)-po = 99/180-.6 = -1.37 po(1-po)/n .6*.4/180 A 17 P(het)+ Z p(het)*(1-p(het))/(n-1). 99/180+ 2.575 99/180)*(1-99/180)/(180-1). So its from 0.454 to 0.6458 D 18 This is one-tail test. So the reject area should be Z* (.01)&lt; -2.33 B 19 N= Z 2 *p(het)(1-p(het)) = 2.575 2 *(99/180)(1-99/180) = 337 E 2 0.07 2 E 20 F = MS Columns = 0.685 = 15.22 MS Error 0.045 A 21 The correct set of hypothesis for this test is Ha: At lease one pair of 1, 2, 3 is different E 22 F*=6.0 &gt; F(0.05, 2, 8)=4.46, so Reject Ho B 23 SS Row = 2.336 * 4 = 9.34 B 24 F* = MS Rows = 2.336 = 51.91 MS Error 0.045 A 25* F .05,4,8 = 3.84 &lt; F alpha, 4, 8 =4.5 &lt; F .025,4,8 = 5.05 .025&lt;p &lt;.05 C...
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This note was uploaded on 03/09/2011 for the course DSC 3710 taught by Professor Staff during the Spring '09 term at North Texas.

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Exam1Sp02AKey - the book. 3.86&amp;amp;gt;2.763,...

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