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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

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

Free

True False

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True

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

Free

True False

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False

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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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 k^{th} 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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