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Biostatistics

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A-124 ANSWERS TO ODD-NUMBERED EXERCISES<br />

49. 95.0% C.I. for m 1 m 2 : ð 83:8; 20Þ<br />

t test m 1 m 2 ðvs: not ¼Þ : t ¼ 3:30 p ¼ :0021 d:f: ¼ 42<br />

t test m 1 m 2 ðvs: < Þ : t ¼ 3:30 p ¼ :0011 d:f: ¼ 42<br />

51. 95.0% C.I. for m GROUP 1–m GROUP 2 (.5, 26.4)<br />

t test m GROUP 1 ¼ m GROUP 2 ðvs: not ¼Þ : t ¼ 2:88 p ¼ :045 d:f: ¼ 4<br />

53. 95.0% C.I. for m 1 m 2 : ð 3:00; 22Þ<br />

t test m 1 ¼ m 2 ðvs: not ¼Þ : t ¼ :29 p ¼ :77 d:f: ¼ 53<br />

Both use Pooled StDev ¼ 4:84<br />

55. 95.0% C.I. for m PT m C : ð7:6; 18:8Þ<br />

t test m PT ¼ m C ðvs: not ¼Þ : t ¼ 4:78 p ¼ 0:0000 d:f: ¼ 31<br />

Chapter 8<br />

Answers for 8.2.1–8.2.7 obtained by SAS 1<br />

8.2.1. F = 6.24<br />

p = .0004<br />

Alpha 0.05<br />

Error Degrees of Freedom 325<br />

Error Mean Square 1.068347<br />

Critical Value of Studentized Range 3.65207<br />

Comparisons significant at the 0.05 level are indicated<br />

by ***.<br />

Difference<br />

Simultaneous<br />

Group Between 95% Confidence<br />

Comparison Means Limits<br />

90 - 30 0.1911 -0.1831 0.5652<br />

90 - 120 0.6346 0.1320 1.1372 ***<br />

90 - 60 0.6386 0.1360 1.1413 ***<br />

30 - 90 -0.1911 -0.5652 0.1831<br />

30 - 120 0.4436 -0.1214 1.0085<br />

30 – 60 0.4476 -0.1173 1.0125<br />

120 - 90 -0.6346 -1.1372 -0.1320 ***<br />

120 - 30 -0.4436 -1.0085 0.1214<br />

120 - 60 0.0040 -0.6531 0.6611<br />

60 - 90 -0.6386 -1.1413 -0.1320 ***<br />

60 - 30 -0.4476 -1.0125 0.1173<br />

60 - 120 -0.0040 -0.6611 0.6531<br />

8.2.3. F = 9.36<br />

p = < .0001<br />

Alpha 0.05<br />

Error Degrees of Freedom 109

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