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

Find the mean score of the following set of scores: 2, 5, 7, 4, 8 .

A common practice in research is to use the 75 percent confidence interval about the mean in research studies.

A frequency distribution of the population elements is called a(n) _____ distribution.

Which of the following represents the standard deviation of the sampling distribution?

"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.

An estimate of the population mean in the form of a single value, usually the sample mean, is called a _____.

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

A frequency distribution is a set of data organized by summarizing the number of times a particular value of a variable occurs.

Describe the measures of dispersion and explain why standard deviation is used most often.

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

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

Three factors are required to specify sample size: (1) the variance of the population; (2) the population mean; and (3) the confidence level.

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

The following formula is the formula for calculating the ______ .

Explain the central-limit theorem and discuss why it is useful to researchers.

The percentage of elements that meet some criterion is called a(n) _____.

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

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?

Hank has developed a set of data organized by summarizing the values resulting from rolling a pair of die. He constructed a table of his data and found that five was the most common result. This is an example of a _____.

The _____ distribution is bell shaped.