Question 1

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

Accepted Answer

A)  4.8 
B)  5.2 
C)  7 
D)  26

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

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

Accepted Answer

The answer of A frequency distribution of the population elements...

Question 4

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

Accepted Answer

A)  range 
B)  standard median 
C)  dispersion 
D)  standard error of the mean

Question 5

"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.

Accepted Answer

A) True 
 B)False

Question 6

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

Accepted Answer

A)  confidence interval estimate 
B)  standard deviation 
C)  point estimate 
D)  variant

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

The answer of Describe the measures of dispersion and explain...

Question 10

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

Accepted Answer

The answer of List the characteristics of the standardized normal...

Question 11

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

Accepted Answer

The answer of The middle score in the rank order...

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

The following formula is the formula for calculating the ______ .

Accepted Answer

A)  standard error of the mean 
B)  standard deviation 
C)  standard normal distribution 
D)  variance

Question 15

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

Accepted Answer

The answer of Explain the central-limit theorem and discuss why...

Question 16

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

Accepted Answer

A)  top-box score 
B)  distribution 
C)  proportion 
D)  range

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

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?

Accepted Answer

The answer of Describe the measures of central tendency and...

Question 19

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 _____.

Accepted Answer

A)  population parameter 
B)  mean 
C)  frequency distribution 
D)  median

Question 20

The _____ distribution is bell shaped.

Accepted Answer

The answer of The _____ distribution is bell shaped....

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.