Question 1

Approximately _____ of all scores in a normal distribution occur between 2 SDs below the mean and 2 SDs above the mean.

Accepted Answer

A)  13% 
B)  34% 
C)  68% 
D)  95% 
A)  13% 
B)  34% 
C)  68% 
D)  95%

Question 2

Define variability. Why is it important to obtain a measure of variability in addition to a measure of central tendency?

Accepted Answer

Variability, also known as dispersion, r

Question 3

Suppose we obtain a significant correlation of r = .40. This correlation accounts for _______ of the variance.

Accepted Answer

A)  4% 
B)  16% 
C)  40% 
D)  .40% 
A)  4% 
B)  16% 
C)  40% 
D)  .40%

Question 4

An inferential statistical test used to evaluate the difference between two means is known as a

Accepted Answer

A)  one-factor ANOVA. 
B)  t test. 
C)  z test. 
D)  correlational test. 
A)  one-factor ANOVA. 
B)  t test. 
C)  z test. 
D)  correlational test.

Question 5

Darnell would like to calculate a measure of central tendency for his rank-ordered data. Darnell should use the

Accepted Answer

A)  mean. 
B)  median. 
C)  mode. 
D)  Central tendency cannot be calculated for this data. 
A)  mean. 
B)  median. 
C)  mode. 
D)  Central tendency cannot be calculated for this data.

Question 6

What is a line graph? Under what circumstances do researchers use a line graph? Distinguish between the ordinate and the abscissa. Draw a sample line graph.

Accepted Answer

A line graph is a type of chart that dis

Question 7

Which measure of central tendency takes into account the value of every number in the distribution?

Accepted Answer

A)  Mean 
B)  Mode 
C)  Median 
D)  Variance 
A)  Mean 
B)  Mode 
C)  Median 
D)  Variance

Question 8

________ errors are under the direct control of the experimenter, and _______ errors are not under the direct control of the experimenter.

Accepted Answer

A)  Type I; Type II 
B)  Type II; Type I 
C)  Type II; hypothesis 
D)  Type I; hypothesis 
A)  Type I; Type II 
B)  Type II; Type I 
C)  Type II; hypothesis 
D)  Type I; hypothesis

Question 9

The _________ is the score that divides the distribution in half.

Accepted Answer

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

Question 10

Which of the following is a limitation of the ordinal scale of measurement?

Accepted Answer

A)  The ordinal scale of measurement represents a simple classification system. 
B)  There is no way to measure central tendency for variables measured on the ordinal scale of measurement. 
C)  When variables are measured on an ordinal scale of measurement, the intervals between numbers are not necessarily equal. 
D)  All of the above are limitations of the ordinal scale of measurement. 
A)  The ordinal scale of measurement represents a simple classification system. 
B)  There is no way to measure central tendency for variables measured on the ordinal scale of measurement. 
C)  When variables are measured on an ordinal scale of measurement, the intervals between numbers are not necessarily equal. 
D)  All of the above are limitations of the ordinal scale of measurement.

Question 11

The ability of a number in a specified set to assume any value is known as

Accepted Answer

A)  degrees of freedom. 
B)  a t test. 
C)  a one-tailed test. 
D)  a Type II error. 
A)  degrees of freedom. 
B)  a t test. 
C)  a one-tailed test. 
D)  a Type II error.

Question 12

What is the first step in calculating the mean?

Accepted Answer

A)  Add up all the scores. 
B)  Locate the most frequently occurring score. 
C)  Rank-order the scores from lowest to highest. 
D)  Locate the least frequently occurring score. 
A)  Add up all the scores. 
B)  Locate the most frequently occurring score. 
C)  Rank-order the scores from lowest to highest. 
D)  Locate the least frequently occurring score.

Question 13

What are the properties of the nominal scale of measurement? Give an example.

Accepted Answer

The nominal scale of measurement is one

Question 14

Isabelle would like to calculate a measure of central for number of errors rats made while running a maze. Isabelle should calculate the

Accepted Answer

A)  range. 
B)  mean. 
C)  mode. 
D)  standard deviation. 
A)  range. 
B)  mean. 
C)  mode. 
D)  standard deviation.

Question 15

If our statistical result occurs often by chance, we conclude that it is

Accepted Answer

A)  significant. 
B)  not significant. 
C)  proven. 
D)  not proven. 
A)  significant. 
B)  not significant. 
C)  proven. 
D)  not proven.

Question 16

The median can be calculated for

Accepted Answer

A)  nominal data only. 
B)  interval or ratio data. 
C)  ordinal, interval, or ratio data. 
D)  nominal, ordinal, interval, or ratio data. 
A)  nominal data only. 
B)  interval or ratio data. 
C)  ordinal, interval, or ratio data. 
D)  nominal, ordinal, interval, or ratio data.

Question 17

What are the properties of the ordinal scale of measurement? Give an example.

Accepted Answer

The ordinal scale of measurement is a ty

Question 18

If there are equal intervals between numbers but no true zero point, we are using a(n) __________ scale of measurement.

Accepted Answer

A)  ordinal 
B)  ratio 
C)  interval 
D)  nominal 
A)  ordinal 
B)  ratio 
C)  interval 
D)  nominal

Question 19

What kind of study is this (e.g., survey, case study, observational study, correlational study, experiment)? How do you know?

Accepted Answer

Experiment - there i

Question 20

Tammy conducted a study in which participants rank-ordered their favorite free-time activities. Tammy used a(n) _________ scale of measurement.

Accepted Answer

A)  ratio 
B)  nominal 
C)  interval 
D)  ordinal 
A)  ratio 
B)  nominal 
C)  interval 
D)  ordinal

Approximately _____ of all scores in a normal distribution occur between 2 SDs below the mean and 2 SDs above the mean.

Define variability. Why is it important to obtain a measure of variability in addition to a measure of central tendency?

Suppose we obtain a significant correlation of r = .40. This correlation accounts for _______ of the variance.

An inferential statistical test used to evaluate the difference between two means is known as a

Darnell would like to calculate a measure of central tendency for his rank-ordered data. Darnell should use the

What is a line graph? Under what circumstances do researchers use a line graph? Distinguish between the ordinate and the abscissa. Draw a sample line graph.

Which measure of central tendency takes into account the value of every number in the distribution?

__ errors are under the direct control of the experimenter, and _ errors are not under the direct control of the experimenter.

The _________ is the score that divides the distribution in half.

Which of the following is a limitation of the ordinal scale of measurement?

The ability of a number in a specified set to assume any value is known as

What is the first step in calculating the mean?

What are the properties of the nominal scale of measurement? Give an example.

Isabelle would like to calculate a measure of central for number of errors rats made while running a maze. Isabelle should calculate the

If our statistical result occurs often by chance, we conclude that it is

The median can be calculated for

What are the properties of the ordinal scale of measurement? Give an example.

If there are equal intervals between numbers but no true zero point, we are using a(n) __________ scale of measurement.

What kind of study is this (e.g., survey, case study, observational study, correlational study, experiment)? How do you know?

Tammy conducted a study in which participants rank-ordered their favorite free-time activities. Tammy used a(n) _________ scale of measurement.

Psychological Research and the Research Methods Course

Developing a Good Research Idea and Conducting an Ethical Project

Qualitative Research Methods

Nonexperimental Methods: Descriptive Methods, Correlational Studies, Ex Post Facto Studies, Surveys and Questionnaires, Sampling, and Basic Research Strategies

Using the Scientific Method in Psychology

Conducting a Good Experiment I: Variables and Control

Conducting a Good Experiment Ii: Final Considerations, Unanticipated Influences, and Cross-Cultural Issues

Internal and External Validity

Designing, Conducting, Analyzing, and Interpreting Experiments With Two Groups

Designing, Conducting, Analyzing, and Interpreting Experiments With More Than Two Groups

Designing, Conducting, Analyzing, and Interpreting Experiments With Multiple Independent Variables

Alternative Research Designs

Writing and Assembling an Apa-Format Research Report

Filters

Exam 9: Using Statistics to Answer Questions

Approximately _____ of all scores in a normal distribution occur between 2 SDs below the mean and 2 SDs above the mean.

Define variability. Why is it important to obtain a measure of variability in addition to a measure of central tendency?

Suppose we obtain a significant correlation of r = .40. This correlation accounts for _______ of the variance.

An inferential statistical test used to evaluate the difference between two means is known as a

Darnell would like to calculate a measure of central tendency for his rank-ordered data. Darnell should use the

What is a line graph? Under what circumstances do researchers use a line graph? Distinguish between the ordinate and the abscissa. Draw a sample line graph.

Which measure of central tendency takes into account the value of every number in the distribution?

________ errors are under the direct control of the experimenter, and _______ errors are not under the direct control of the experimenter.

The _________ is the score that divides the distribution in half.

Which of the following is a limitation of the ordinal scale of measurement?

The ability of a number in a specified set to assume any value is known as

What is the first step in calculating the mean?

What are the properties of the nominal scale of measurement? Give an example.

Isabelle would like to calculate a measure of central for number of errors rats made while running a maze. Isabelle should calculate the

If our statistical result occurs often by chance, we conclude that it is

The median can be calculated for

What are the properties of the ordinal scale of measurement? Give an example.

If there are equal intervals between numbers but no true zero point, we are using a(n) __________ scale of measurement.

What kind of study is this (e.g., survey, case study, observational study, correlational study, experiment)? How do you know?

Tammy conducted a study in which participants rank-ordered their favorite free-time activities. Tammy used a(n) _________ scale of measurement.

Psychological Research and the Research Methods Course

Developing a Good Research Idea and Conducting an Ethical Project

Qualitative Research Methods

Nonexperimental Methods: Descriptive Methods, Correlational Studies, Ex Post Facto Studies, Surveys and Questionnaires, Sampling, and Basic Research Strategies

Using the Scientific Method in Psychology

Conducting a Good Experiment I: Variables and Control

Conducting a Good Experiment Ii: Final Considerations, Unanticipated Influences, and Cross-Cultural Issues

Internal and External Validity

Designing, Conducting, Analyzing, and Interpreting Experiments With Two Groups

Designing, Conducting, Analyzing, and Interpreting Experiments With More Than Two Groups

Designing, Conducting, Analyzing, and Interpreting Experiments With Multiple Independent Variables

Alternative Research Designs

Writing and Assembling an Apa-Format Research Report

Filters

__ errors are under the direct control of the experimenter, and _ errors are not under the direct control of the experimenter.