Stratified random sampling is a method of selecting a sample in which 答案: the population is first divided into strata， and then random samples are drawn from each stratum

Stratified random sampling is a method of selecting a sample in which

答案: the population is first divided into strata， and then random samples are drawn from each stratum

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相关试题

A population consists of 500 elements. We want to draw a simple random sample of 50 elements from this population. On the first selection， the probability of an element being selected is

答案: 0.002

As the sample size increases， the

答案: standard error of the mean decreases

If we consider the simple random sampling process as an experiment， the sample mean is

答案: a random variable

As the sample size becomes larger， the sampling distribution of the sample mean approaches a

答案: normal distribution

The standard deviation of a sample of 100 elements taken from a very large population is determined to be 60. The variance of the population

答案: can be any value greater or equal to zero

A probability distribution for all possible values of a sample statistic is known as

答案: a sampling distribution

A population has a mean of 300 and a standard deviation of 18. A sample of 144 observations will be taken. The probability that the sample mean will be between 297 to 303 is

答案: 0.8664

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

答案: central limit theorem

A sample of 400 observations will be taken from an infinite population. The population proportion equals 0.8. The probability that the sample proportion will be greater than 0.83 is

答案: 0.0668

Which of the following is(are) NOT point estimator(s)?

答案: s;
m;
a

Which of the following is an example of probability sampling?

答案: simple random sampling;
stratified simple random sampling;
systematic sampling;
cluster sampling

Which of the following is an example of non probability sampling?

答案: convenience sampling;
judgment sampling

The error that occurs because a sample， and not the entire population， is used to estimate a population parameter is a sampling error.

答案: 正确

Cluster sampling is a non probability sampling method.

答案: 错误

A method of selecting a sample by randomly selecting the first element and then selecting every Kth element thereafter is stratified simple random sampling

答案: 错误

In a sample survey， it is common practice to use a t value of (when approximating a 95% confidence interval)

答案: 错误

A sampling unit must have one element.

答案: 错误

Conclusions drawn from a sample survey apply to any population.

答案: 错误