Kizspy | Question: 93
(Choose 1 answer)
Let 20.05 1.645; 20.025 = 1.960
The life in hours of a light bulb is known to be normally distributed with standard deviation 25 hours. A random sample of 15 bulbs has a mean life 1050 hours and standard deviation 45 hours. Construct a 95% confidence interval on the mean life.
Α. (1037; 1063)
Β. (1039; 1061)C. (1031; 1069)
D. (1027; 1073)
E. None of the other choices is correct
