the specimen of copper wires drawn from a large lot have the follwing breaking strength (in...
the specimen of copper wires drawn from a large lot have the follwing breaking strength (in kg. weight): 578,572,570,568,572,578,570,596,544 determine 95% confidence interval for the true mean breaking strength
Homework Answers
Ans:
| 1 | 578 |
| 2 | 572 |
| 3 | 570 |
| 4 | 568 |
| 5 | 572 |
| 6 | 578 |
| 7 | 570 |
| 8 | 596 |
| 9 | 544 |
| mean= | 572 |
| std. dev= | 13.5 |
n=9
df=9-1=8
critical t value=tinv(0.05,8)=2.306
95% confidence interval for mean
=572+/-2.306*13.5/sqrt(9)
=572+/-10.38
=(561.62, 582.38)
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