Assignment4Livesol due by Midnight (11:59pm) Sunday, April
3
rd
True/False questions carry 1.5 points each, Multiple Choices carry two points each and the
Essay type questions carry 5 points each. The total score is 50 points.
True/False (1.5 points each)
Chapter 7
1. A sample size of 1000 is large enough to use normal approximation for the
distribution of p, when the estimate of the population proportion is .990.
False
2. For any sampled population, the population of all sample means is not always
normally distributed.
True
3
.
The mean of the sampling distribution of
is not always equal to the mean of
the sampled population.
False
4. The standard deviation of all possible sample proportions decreases as the
sample size increases.
True
Chapter 8
5. Assuming the same significance level
α
, as the sample size increases, the value
of
t
α
/2
becomes smaller and smaller and approaches the corresponding value of
z
α
/2
.
True
6
.
First a confidence interval is constructed without using the finite population
correction factor. Then, for the same identical data, a confidence interval is
constructed using the finite population correction factor. The width of the interval
without the finite population correction factor is narrower than the confidence
interval with the finite population correction factor.
False
7. 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
1
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wider than a confidence interval for a population mean based on a sample of n =
150.
True
8
. When the level of confidence and the sample size remain the same, a confidence
interval for a population mean
µ
will be narrower, when the sample standard
deviation s is larger than when s is small.
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 Spring '11
 sda
 Standard Deviation, 56.36%, 42.07%, 84.13%, 7.93%

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