Kizspy Question: 38
(Choose 1 answer)
(See picture)
A. (505.88; 528.52)
B. (507; 527)
C. (512; 525)
D. None of the others
The brightness of a television picture tube can
be evaluated by measuring the amount of cur-
rent required to achieve a particular brightness
level. A sample of 20 tubes results in = 517.2
and s 17.7. Find a 99% CI on mean current
required. Let t0.005,19 = 2.861; to.01.19 = 2.539.
Assume that the data are a random sample
from a normal distribution.
