TRUE OR FALSE
1. The standard deviation of the sampling distribution of the
sample mean increases as the sample size increases.
2. When the population is normally distributed and the
population standard deviation o is unknown, then for any
sample size n, the sampling distribution of (X-bar) is based on the
t distribution.
3. When the level of confidence and sample standard deviation
remain the same, a confidence interval for a population mean based
on a sample of n=100 will be wider than a confidence interval for a
population mean based on a sample of n=150.
4. When the level of confidence and the sample size remain the
same, a confidence interval for a population mean u will be
narrower, when the sample standard deviation s is smaller than when
s is larger.
MULTIPLE CHOICE
5. A confidence interval increases in width as
A) the level of confidence decreases
B) N increases
C) S decreases
D) All of the above
E) None of the above