Exam 17: Determination of Sample Size: a Review of Statistical Theory

A frequency distribution of a sample is called a(n) _____.

The _____ distribution is a symmetrical, bell-shaped distribution that describes the expected probability distribution of many chance occurrences.

Measures computed from sample data are called _____.

A confidence range is a specified range of numbers within which a population mean is expected to lie.

Which of the following is the symbol for the population standard deviation?

If between 125 and 150 units of a product have been produced each day during the past month, the range of this production is 150 units.

The average deviation score is frequently used in business research studies.

The confidence interval increases as the sample size, n, increases.

The simplest measure of the dispersion of a set of scores is the ______ .

A point estimate is an estimate of the population mean in the form of a single value.

In statistical terms, ______ the sample size ______ the width of the confidence interval about the mean at a given confidence level.

If the sample standard deviation is 10.5 and the sample mean is 48 based on a study with a sample size of 120, the 95 percent confidence interval about the mean is between approximately _____.

Three factors in determining sample size for questions involving means are: (1) the variance, or heterogeneity, of the population; (2) the magnitude of acceptable error; and (3) the _____.

The standard deviation eliminates the drawback of having the measure of dispersion in squared units rather than the original measurement units.

Find the median of the following scores: 1, 2, 3, 4, 5, 5, 7

A frequency distribution organized into a table or graph that summarizes percentage values associated with particular values of a variable is called a(n) _____.

Compare and contrast statistics and inferential statistics. Which one is most appropriate for causal research?

Explain how point estimates and confidence interval estimates are related and the role of confidence level in this relationship.

The standardized normal distribution is a purely theoretical probability distribution and is of little use in inferential statistics.

The measure of central tendency that identifies the value that occurs most often is called the _____.