Exam 13: Big Data Basics: Describing Samples and Populations

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

The standardized normal distribution has a mean of 1.0 and a standard deviation of zero.

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

In most cases,the size of the population does not have a major effect on the sample size.

Which of the following eliminates the drawback of having the measure of dispersion in squared units rather than in the original measurement units?

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

List the characteristics of the standardized normal distribution and explain why it is a useful distribution in inferential statistics.

In computing a 95 percent confidence interval about a proportion for a sample size of 40,the appropriate Z-value to be used is ____________________.

Percentage frequency is the long-run relative frequency with which an event will occur.

Name and describe the measures of central tendency.

Find the approximate standard deviation of the following set of scores: 3,6,2,7,8.

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

Summary measures about variables computed using only data taken from a sample are called sample:

The idea that as sample size increases,the distribution of sample means of samples of size n,when randomly selected,approaches a normal distribution is known as the ____________________.

All of the following are characteristics of the standardized normal distribution EXCEPT that it ____.

The central limit theorem states that,as sample size increases,the distribution of sample means of samples of size n (when randomly selected)approaches a normal distribution.

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

Which of the following is not a measure of the central tendency of a set of scores?

Which theorem states that as sample size increases,the distribution of sample means of size n,randomly selected,approaches a normal distribution?

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