Homework Answers
Solution: Given that samples 1230,940,850,670,450,1260,1310,640,960,1210,770,720,860,930,630,400,870,730,1080,720,850,960,950,1440,970,1040,1200,1310,1320,1080,800,1080,740,1340,580,1210,560,1090,900,800,1030,1100,1220,640,980,1060,920,1050,930,1290,940,1300,1050,740,870,600,1420,1040,1130,900,670,580,1010,930,1120,700,800,460,1170,1010,1240,1120,1270,440,1290,220,1410,1120,1160,1460
6. option c. 960.5
7. option d. 74222.53
8. option a. 60.6
Explanation : x = 960.5, s = 272.44, n = 80, 95% Confidece
interval
df = n-1 = 79, t = 1.99
=> 1.99*272.44/sqrt(80) = 60.61
9. option d. 1021.1
Explanation : 960.5+60.6 = 1021.1
10. d. 601
Explanation : n = (1.96*250/20)^2 = 600.25 = 601
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