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The life in hours of a 75-watt light bulb is known to be normally distributed with = 20 hours. A random sample of 18 bulbs
The life in hours of a 75-watt light bulb is known to be normally distributed with = 20 hours. A random sample of 18 bulbs has a mean life of x= 1020 hours.
- Construct a 95% two-sided confidence interval on the mean life.
- Construct a 95% lower-confidence bound on the mean life.
- Compare the lower bound on this confidence interval with the one in part (a).
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College Algebra
Authors: Jogindar Ratti, Marcus S McWaters
2nd Edition
0321900014, 9780321900012
