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After computing a confidence interval, the user believes the results are meaningless because the width of the interval is too large. Which one of the following is the best recommendation?
Increase the sample size.
The sample statistic, such as , s, or , that provides the point estimate of the population parameter is known as
a point estimator
The absolute value of the difference between the point estimate and the population parameter it estimates is
the sampling error
Whenever the population standard deviation is unknown and the population has a normal or near-normal distribution, which distribution is used in developing an interval estimation?
In determining the sample size necessary to estimate a population proportion, which of the following information is not needed?
the mean of the population
If a hypothesis is not rejected at the 5% level of significance, it
will also not be rejected at the 1% level
Whenever the population standard deviation is known which distribution is used in developing an interval estimation?
A probability distribution for all possible values of a sample statistic is known as
a sampling distribution
A theorem that allows us to use the normal probability distribution to approximate the sampling distribution of sample means and sample proportions whenever the sample size is large is known as the
central limit theorem
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