Exam 13: Reviewing Statistical Theory and Determining Sample Size

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

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

Measures computed from sample data are called _____.

Which of the following is a measure of dispersion?

The midpoint of a distribution,above which and below which half of the scores fall,is called the mode.

The standardized value of Z is computed by the formula: Z = (X - m)/s.

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

"As sample size increases,the distribution of sample means of samples of size n (when randomly selected)approaches a normal distribution" is a fundamental assumption of the central-limit theorem.

The middle score in the rank order of scores is called the ______ score.

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

When a data set is summarized by counting the number of times each value for a variable occurs in the sample,this is known as a(n)______.

When a researcher wants to estimate national market share based on the results of the test market for a new product in St.Louis and Kansas City,this is an example of _____.

A frequency distribution of a sample is called a probability distribution.

An estimate of the population mean in the form of a single value is called a(n)_____.

Discuss the three factors required to specify sample size.

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 ______.

Variables in a sample or measures computed from sample data are called _____.

Describe the measures of central tendency and calculate each for the following salary data: $25,000,$35,000,$35,000,$40,000,$50,000,$70,000,and $350,000.Which is the best measure of central tendency for this data?

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

The arithmetic average of a set of numbers is referred to as the _____.