QUESTION 1: Parameters are

numerical characteristics of a sample

numerical characteristics of a population

the averages taken from a sample

numerical characteristics of either a sample or a population

QUESTION 2: Stratified random sampling is a method of selecting a sample in which

the sample is first divided into strata, and then random samples are taken from each stratum

various strata are selected from the sample

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

None of these alternatives is correct.

QUESTION 3: 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

approximation theorem

normal probability theorem

central limit theorem

central normality theorem

QUESTION 4: In point estimation

data from the population is used to estimate the population parameter

data from the sample is used to estimate the population parameter

data from the sample is used to estimate the sample statistic

the mean of the population equals the mean of the sample

QUESTION 5: The sample statistic s is the point estimator of

μ

σ

x ¯

p

QUESTION 6: The sample mean is the point estimator of

μ

σ

x ¯

p-

QUESTION 7: The standard deviation of all possible x ¯ values is called the

standard error of proportion

standard error of the mean

mean deviation

central variation

QUESTION 8: A sample statistic, such as a sample mean, is known as

a statistic

a parameter

the mean deviation

the central limit theorem

QUESTION 9: The purpose of statistical inference is to provide information about the

sample based upon information contained in the population

population based upon information contained in the sample

population based upon information contained in the population

mean of the sample based upon the mean of the population

QUESTION 10: Random samples of size 81 are taken from an infinite population whose mean and standard deviation are 200 and 18, respectively. The distribution of the population is unknown. The mean and the standard error of the mean are

200 and 18

81 and 18

9 and 2

200 and 2