Exam1Sp02CKey

# Exam1Sp02CKey - the book. 3.86&amp;amp;gt;2.763,...

This preview shows pages 1–2. Sign up to view the full content.

Spring 2002 Exam 1 Solutions MSCI3710 No. Solution Version C 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 A 3 Z= (X- μ )/( σ / n)=(7750-7500)/(975 / 36) = 1.54 D 4 Z (alpha/2)=1.645. Because this is the two-tail test. The reject area should be to the left of Z=-1.645, and to the right of Z=1.645 B 5 Z*=2.60 > Z (alpha/2)=1.645, so Reject Ho, which means the average is not equal to \$7500 C 6 If Z* = 1.645, p=0.05*2=0.10 A 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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

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*=1.6 &lt; F(0.05, 2, 8)=4.46, so Fail to reject Ho D 23 SS Row = 2.336 * 4 = 9.34 B 24 F* = MS Rows = 2.336 = 51.91 MS Error 0.045 A 25 F alpha, 4, 8 =14.5 &gt; F .01,4,8 = 7.01 p &lt;.01 E...
View Full Document

## 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.

### Page1 / 2

Exam1Sp02CKey - the book. 3.86&amp;amp;gt;2.763,...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online