Question 1

The variance of a group of scores is 9. What is the standard deviation?

Accepted Answer

A) 1 
B) 3 
C) 4.5 
D) 81 
A) 1 
B) 3 
C) 4.5 
D) 81

Question 2

For a particular group of scores, M = 15 and SD = 3. Provide the raw score for a Z score of 7:

Accepted Answer

A) 15 
B) 24 
C) 36 
D) 48 
A) 15 
B) 24 
C) 36 
D) 48

Question 3

The variance of a group of scores is the same as the:

Accepted Answer

A) average of the squared deviations from the mean 
B) sum of the squared deviations about the mean 
C) average of the absolute deviations from the mean 
D) sum of the absolute deviations from the median 
A) average of the squared deviations from the mean 
B) sum of the squared deviations about the mean 
C) average of the absolute deviations from the mean 
D) sum of the absolute deviations from the median

Question 4

A research team studied the rate at which infants in the three different countries vocalized distress. Below are the scores from each country. Which group of infants showed the highest mean rate of distress vocalization over the 45-minute observation period? Country A: 9, 9, 10, 13, 8, 8, 11, 11, 10, 7, 13, 6, 18, 9, 9, 12, 13, 10, 5, 14
Country B: 15, 15, 16, 19, 14, 14, 17, 17, 16, 13, 19, 12, 18, 10, 10, 15, 15, 2, 2, 5
Country C: 4, 6, 20, 17, 15, 30, 18, 18, 25, 2, 29, 17, 16, 35, 19, 1, 30, 25, 16, 15

Accepted Answer

A) Country A 
B) Country B 
C) Country C 
D) Countries B and C were equal 
A) Country A 
B) Country B 
C) Country C 
D) Countries B and C were equal

Question 5

A Canadian political scientist discovers that the number of members of their provincial parliament that a group of voters can name is as follows: 3, 3, 3, 4, 4, 5, 6, 7, 8, 9, 10, 35. Upon examination of these scores, the researcher would probably decide to use which measure of the typical value?

Accepted Answer

A) Mean 
B) Median 
C) Mode 
D) Standard deviation 
A) Mean 
B) Median 
C) Mode 
D) Standard deviation

Question 6

Five high school English teachers were given a grammar test. Their scores were as follows: 17, 19, 14, 20, 20.
Figure the mean, mode, variance, and standard deviation for this sample.
Explain what you have done and what the results mean to a person who has never had a course in statistics.

Accepted Answer

Mean = 90/5 = 18
Mode = 20
Var

Question 7

What is the standard deviation of these four scores: 2, 4, 3, 7?

Accepted Answer

A) 1.87 
B) 2.35 
C) 3.50 
D) 4.05 
A) 1.87 
B) 2.35 
C) 3.50 
D) 4.05

Question 8

A teacher rated the reading ability level of six fourth-grade children participating in a special math program. The ratings were as follows: 3, 3, 2, 8, 4, 4.
Figure the mean, variance, and standard deviation for this group of scores.
Explain what you have done and what the results mean to a person who has never had a course in statistics.

Accepted Answer

Mean = 24/6 = 4
Mode = bimodal

Question 9

A research article states that "At the time of the study, the mean age of first-year college students at Wayne University was 17.6 (3.57). The number in parentheses likely represents:

Accepted Answer

A) the Z score 
B) the standard deviation 
C) the mode 
D) an outlier 
A) the Z score 
B) the standard deviation 
C) the mode 
D) an outlier

Question 10

A group of scores is 2, 81, 82, 82, 84, 86, 90. The number __________ is an outlier.

Accepted Answer

The answer of A group of scores is 2, 81,...

Question 11

While the mean provides a representative value of a group of scores, it does not tell about the __________.

Accepted Answer

A) variability of the scores 
B) average of the scores 
C) spread of the scores around the mean 
D) both A and C 
A) variability of the scores 
B) average of the scores 
C) spread of the scores around the mean 
D) both A and C

Question 12

Although __________ and __________ are often provided in research articles (in the text or tables), _________ are rarely reported.

Accepted Answer

A) variance, range, Z scores 
B) Z scores, T scores, means 
C) means, standard deviations, Z scores 
D) outliers, Z scores, means 
A) variance, range, Z scores 
B) Z scores, T scores, means 
C) means, standard deviations, Z scores 
D) outliers, Z scores, means

Question 13

The rule for calculating the mean is to add up all the scores in a sample and divide by the __________.

Accepted Answer

A) median 
B) number of scores minus 1 
C) number of scores 
D) most frequent score 
A) median 
B) number of scores minus 1 
C) number of scores 
D) most frequent score

Question 14

Measures of variability, such as the variance and standard deviation, are heavily influenced by the presence of one or more:

Accepted Answer

A) average scores 
B) computational formulas 
C) variables 
D) extreme scores or outliers 
A) average scores 
B) computational formulas 
C) variables 
D) extreme scores or outliers

Question 15

The __________ is the value with the most scores.

Accepted Answer

The answer of The __________ is the value with the...

Question 16

The mean of the scores 2, 2, 2, 6 is __________.

Accepted Answer

The answer of The mean of the scores 2, 2,...

Question 17

In a perfectly symmetrical unimodal distribution, the mode is the same as the mean. (True or False)

Accepted Answer

A) True 
 B)False

Question 18

The standard deviation is defined as the:

Accepted Answer

A) positive square root of the variance 
B) positive square root of the range 
C) negative square root of the variance 
D) positive square root of the mean or median 
A) positive square root of the variance 
B) positive square root of the range 
C) negative square root of the variance 
D) positive square root of the mean or median

Question 19

The most common single number in a group of scores is the:

Accepted Answer

A) mode 
B) mean 
C) median 
D) average 
A) mode 
B) mean 
C) median 
D) average

Question 20

A Z score of 2.0 came from a distribution with a mean of 80 and a standard deviation of 10. What is the raw score?

Accepted Answer

A) 82 
B) 90 
C) 100 
D) 170 
A) 82 
B) 90 
C) 100 
D) 170

The variance of a group of scores is 9. What is the standard deviation?

For a particular group of scores, M = 15 and SD = 3. Provide the raw score for a Z score of 7:

The variance of a group of scores is the same as the:

A Canadian political scientist discovers that the number of members of their provincial parliament that a group of voters can name is as follows: 3, 3, 3, 4, 4, 5, 6, 7, 8, 9, 10, 35. Upon examination of these scores, the researcher would probably decide to use which measure of the typical value?

Five high school English teachers were given a grammar test. Their scores were as follows: 17, 19, 14, 20, 20. Figure the mean, mode, variance, and standard deviation for this sample. Explain what you have done and what the results mean to a person who has never had a course in statistics.

What is the standard deviation of these four scores: 2, 4, 3, 7?

A research article states that "At the time of the study, the mean age of first-year college students at Wayne University was 17.6 (3.57). The number in parentheses likely represents:

A group of scores is 2, 81, 82, 82, 84, 86, 90. The number __________ is an outlier.

While the mean provides a representative value of a group of scores, it does not tell about the __________.

Although and are often provided in research articles (in the text or tables), _ are rarely reported.

The rule for calculating the mean is to add up all the scores in a sample and divide by the __________.

Measures of variability, such as the variance and standard deviation, are heavily influenced by the presence of one or more:

The __________ is the value with the most scores.

The mean of the scores 2, 2, 2, 6 is __________.

In a perfectly symmetrical unimodal distribution, the mode is the same as the mean. (True or False)

The standard deviation is defined as the:

The most common single number in a group of scores is the:

A Z score of 2.0 came from a distribution with a mean of 80 and a standard deviation of 10. What is the raw score?

Displaying the Order in a Group of Numbers Using Tables and Graphs

Correlation and Prediction

Some Key Ingredients for Inferential Statistics: the Normal Curve, Sample Versus Population, and Probability

Introduction to Hypothesis Testing

Hypothesis Tests With Means of Samples

Making Sense of Statistical Significance: Effect Size and Statistical Power

Introduction to the T Test: Single Sample and Dependent Means

The T Test for Independent Means

Introduction to the Analysis of Variance

Chi-Square Tests and Strategies When Population Distributions Are Not Normal

Applying Statistical Methods in Your Own Research Project

Filters

Exam 2: The Mean, Variance, Standard Deviation, and Z Scores

The variance of a group of scores is 9. What is the standard deviation?

For a particular group of scores, M = 15 and SD = 3. Provide the raw score for a Z score of 7:

The variance of a group of scores is the same as the:

A Canadian political scientist discovers that the number of members of their provincial parliament that a group of voters can name is as follows: 3, 3, 3, 4, 4, 5, 6, 7, 8, 9, 10, 35. Upon examination of these scores, the researcher would probably decide to use which measure of the typical value?

Five high school English teachers were given a grammar test. Their scores were as follows: 17, 19, 14, 20, 20. Figure the mean, mode, variance, and standard deviation for this sample. Explain what you have done and what the results mean to a person who has never had a course in statistics.

What is the standard deviation of these four scores: 2, 4, 3, 7?

A research article states that "At the time of the study, the mean age of first-year college students at Wayne University was 17.6 (3.57). The number in parentheses likely represents:

A group of scores is 2, 81, 82, 82, 84, 86, 90. The number __________ is an outlier.

While the mean provides a representative value of a group of scores, it does not tell about the __________.

Although __________ and __________ are often provided in research articles (in the text or tables), _________ are rarely reported.

The rule for calculating the mean is to add up all the scores in a sample and divide by the __________.

Measures of variability, such as the variance and standard deviation, are heavily influenced by the presence of one or more:

The __________ is the value with the most scores.

The mean of the scores 2, 2, 2, 6 is __________.

In a perfectly symmetrical unimodal distribution, the mode is the same as the mean. (True or False)

The standard deviation is defined as the:

The most common single number in a group of scores is the:

A Z score of 2.0 came from a distribution with a mean of 80 and a standard deviation of 10. What is the raw score?

Displaying the Order in a Group of Numbers Using Tables and Graphs

Correlation and Prediction

Some Key Ingredients for Inferential Statistics: the Normal Curve, Sample Versus Population, and Probability

Introduction to Hypothesis Testing

Hypothesis Tests With Means of Samples

Making Sense of Statistical Significance: Effect Size and Statistical Power

Introduction to the T Test: Single Sample and Dependent Means

The T Test for Independent Means

Introduction to the Analysis of Variance

Chi-Square Tests and Strategies When Population Distributions Are Not Normal

Applying Statistical Methods in Your Own Research Project

Filters

Although and are often provided in research articles (in the text or tables), _ are rarely reported.