7. Correct. The
answer is true.
(a) 95% confidence interval is
given by and
.
For v=200-1=199 degrees of freedom, find
Therefore, and
Then the 95% confidence limits are and
hours
respectively.
(b) 99% confidence interval limits
are given by and
.
For v=200-1=199 degrees of freedom,
find
Therefore, and
Then the 99% confidence limits are and
hours respectively.
c