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Business Statistics

Statistics

Quiz 7 :

Sampling and Sampling Distributions

Quiz 7 :

Sampling and Sampling Distributions

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Saving time and money are reasons to take a sample rather than do a census.
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True False
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True

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A major limitation of nonrandom samples is that they are not appropriate for most statistical methods.
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True False
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True

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The directory or map from which a sample is taken is called the census.
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True False
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False

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If a researcher wants to study all students in their university and includes only those students in the researcher's class, then the researcher is conducting convenience sampling.
True False
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If every unit of the population has the same probability of being selected for the sample, then the researcher is probably conducting random sampling.
True False
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The mean of the sample means is the same as the mean of the population
True False
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Systematic sampling is a type of random sampling technique.
True False
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With cluster sampling, there is homogeneity within a subgroup or stratum.
True False
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Sampling errors cannot by determined objectively for nonrandom sampling techniques.
True False
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The standard deviation of a sampling distribution of the sample means is commonly called the standard error of the mean.
True False
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A population list, map, directory, or other source used to represent the population and from which a sample is taken, is called a frame.
True False
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The central limit theorem states that if the sample size, n, is large enough (n ≥20), the distribution of the sample means is normally distributed regardless of the shape of the population.
True False
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A nonrandom sampling technique that is similar to stratified random sampling is called quota sampling.
True False
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The two major categories of sampling methods are proportionate and disproportionate sampling.
True False
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In some situations, sampling may be the only option because the population is inaccessible.
True False
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A sampling distribution is the distribution of a sample statistic such as the sample mean or sample proportion.
True False
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If a researcher selects every kth item from a population of N items, then she is likely conducting a systematic random sampling.
True False
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In a random sampling technique, every unit of the population has a randomly varying chance or probability of being included in the sample.
True False
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Increasing the sample size causes the numerical value of standard error of the sample means to increase.
True False
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Cluster (or area)sampling is a type of random sampling technique.
True False
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