Quiz 4

If the expected value of the sample statistic is equal to the population parameter being estimated, the sample statistic is said to _____. a. be a random estimator of the population parameter b. be an unbiased estimator of the population parameter c. have high precision d. have low variability

be an unbiased estimator of the population parameter

In interval estimation, as the sample size becomes larger, the interval estimate _____. a. becomes wider b. gets closer to 1.96 c. becomes narrower d. remains the same, since the mean is not changing

becomes narrower

The finite correction factor should be used in the computation of the standard deviation of the sample mean and the standard population when n / N is _____. a. less than 0.05 b. less than 0.5 c. greater than 0.5 d. greater than 0.05

greater than 0.05

An estimate of a population parameter that provides an interval of values believed to contain the value of the parameter is known as the _____. a. interval estimate b. population estimate c. confidence level d. parameter level

interval estimate

A simple random sample of size n from a finite population of size N is a sample selected such that each possible sample of size _____. a. n has a probability of 0.5 of being selected b. N and n have the same probability of being selected c. n has the same probability of being selected d. n has a probability of 0.05 of being selected

n has the same probability of being selected

A simple random sample of 31 observations was taken from a large population. The sample mean equals 5. Five is a _____. a. point estimate b. population parameter c. population mean d. standard error

point estimate

The purpose of statistical inference is to make estimates or draw conclusions about a _____. a. mean of the sample based upon the mean of the population b. statistic based upon information obtained from the population c. population based upon information obtained from the sample d. sample based upon information obtained from the population

population based upon information obtained from the sample

A random sample selected from an infinite population is a sample selected such that each element selected comes from the same _____ and each element is selected _____. a. population; simultaneously b. sample; simultaneously c. population; independently d. sample; independently

population; independently

The value of the _____ is used to estimate the value of the population parameter. a. sample statistic b. sample parameter c. population estimate d. population statistic

sample statistic

The basis for using a normal probability distribution to approximate the sampling distribution of the sample means and population mean is _____. a. the empirical rule b. the central limit theorem c. Chebyshev's theorem d. Bayes' theorem

the central limit theorem

When the expected value of the point estimator is equal to the population parameter it estimates, it is said to be _____. a. unbiased b. symmetric c. predicted d. precise

unbiased

A parameter is a numerical measure from a population, such as _____. a. p̄ b. s c. μ d. x̄

μ