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25 terms

Statistics

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The level of significance
is (1 - confidence level)
The closer the sample mean is to the population mean,
the smaller the sampling error
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.
In general, higher confidence levels provide
wider confidence intervals
Parameters are
numerical characteristics of a population
Convenience sampling is an example of
nonprobabilistic sampling
As the sample size increases, the
standard error of the mean decreases
The sample statistic, such as , s, or , that provides the point estimate of the population parameter is known as
a point estimator
Cluster sampling is
a probability sampling method
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?
t distribution
As the sample size increases, the margin of error
decreases
In determining the sample size necessary to estimate a population proportion, which of the following information is not needed?
the mean of the population
What type of error occurs if you fail to reject H0 when, in fact, it is not true?
Type II
The p-value is a probability that measures the support (or lack of support) for the
null hypothesis
The error of rejecting a true null hypothesis is
a Type I error
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?
z distribution
A probability distribution for all possible values of a sample statistic is known as
a sampling distribution
A population characteristic, such as a population mean, is called
a parameter
A sample statistic, such as a sample mean, is known as
a statistic
The standard deviation of a point estimator is called the
standard error
A single numerical value used as an estimate of a population parameter is known as
a point estimate
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
The purpose of statistical inference is to provide information about the
population based upon information contained in the sample