Question 1

It is impossible to say what the results of a study are until the inferential statistics have been done.

Accepted Answer

A) True 
 B)False  False

Question 2

Why should researchers be cautious about unexpected results in their data-even when those results are statistically significant?

Accepted Answer

There is a good chance that they are Type I errors. They might have occurred by chance. It is best to try to replicate such results before publishing them.

Question 3

In a positively skewed distribution, which of the following is true?

Accepted Answer

A)  The mean is greater than the median. 
B)  The mean is less than the median. 
C)  The mean is the same as the median. 
D)  It is impossible to tell. 
A)  The mean is greater than the median. 
B)  The mean is less than the median. 
C)  The mean is the same as the median. 
D)  It is impossible to tell. A

Question 4

Research has shown that men have stronger leadership abilities than women.

Accepted Answer

A) True 
 B)False

Question 5

Pearson's r is the mean cross-product of two sets of z scores.

Accepted Answer

A) True 
 B)False

Question 6

A histogram is used to display the distribution of a single variable.

Accepted Answer

A) True 
 B)False

Question 7

A frequency table is used to display the distribution of a variable.

Accepted Answer

A) True 
 B)False

Question 8

Imagine you find an unexpected but statistically significant result in your data. Which of the following courses of action makes the most sense?

Accepted Answer

A)  ignore it 
B)  immediately write it up for publication 
C)  follow up on it in a new research study 
D)  none of the above 
A)  ignore it 
B)  immediately write it up for publication 
C)  follow up on it in a new research study 
D)  none of the above

Question 9

Restriction of range is likely to be a problem in which of the following studies?

Accepted Answer

A)  a study on the relationship between extroversion and risk seeking among college students 
B)  a study on the relationship between age and attitude toward homosexuality among college students 
C)  a study on the relationship between extroversion and leadership ability among the employees of a large corporation 
D)  a study on the relationship between income and happiness among New York City residents 
A)  a study on the relationship between extroversion and risk seeking among college students 
B)  a study on the relationship between age and attitude toward homosexuality among college students 
C)  a study on the relationship between extroversion and leadership ability among the employees of a large corporation 
D)  a study on the relationship between income and happiness among New York City residents

Question 10

Which of the following is most clearly a statement about a statistical relationship between variables?

Accepted Answer

A)  About one-third of Americans have a psychological disorder at some time in their lives. 
B)  Summer temperatures in Phoenix often exceed 100 degrees Fahrenheit. 
C)  "Pain-Away" is more effective at treating headaches than its nearest competitor. 
D)  Prejudice is a serious problem. 
A)  About one-third of Americans have a psychological disorder at some time in their lives. 
B)  Summer temperatures in Phoenix often exceed 100 degrees Fahrenheit. 
C)  "Pain-Away" is more effective at treating headaches than its nearest competitor. 
D)  Prejudice is a serious problem.

Question 11

Which of the following pairs of variables seems most likely to have a negative relationship?

Accepted Answer

A)  intelligence and grade point average 
B)  people's heights and weights 
C)  shyness and number of friends 
D)  the amount people exercise and how much they enjoy sports 
A)  intelligence and grade point average 
B)  people's heights and weights 
C)  shyness and number of friends 
D)  the amount people exercise and how much they enjoy sports

Question 12

A Cohen's d of 1.00 means that two group means differ by one standard deviation.

Accepted Answer

A) True 
 B)False

Question 13

Raw data are data that have not yet been analyzed.

Accepted Answer

A) True 
 B)False

Question 14

The standard deviation is one half the range.

Accepted Answer

A) True 
 B)False

Question 15

Explain why the median is sometimes a better measure of central tendency than the mean.

Accepted Answer

It can be better when a distri

Question 16

The median is the most common score in a distribution.

Accepted Answer

A) True 
 B)False

Question 17

Explain what Pearson's r is for someone who is not already familiar with statistics.

Accepted Answer

It is a measure of t

Question 18

A Pearson's r of -.45 represents a stronger relationship than a Pearson's r of +.37.

Accepted Answer

A) True 
 B)False

Question 19

In a positively skewed distribution, the mean is greater than the median.

Accepted Answer

A) True 
 B)False

Question 20

The variance is the square root of the standard deviation.

Accepted Answer

A) True 
 B)False

It is impossible to say what the results of a study are until the inferential statistics have been done.

Why should researchers be cautious about unexpected results in their data-even when those results are statistically significant?

In a positively skewed distribution, which of the following is true?

Research has shown that men have stronger leadership abilities than women.

Pearson's r is the mean cross-product of two sets of z scores.

A histogram is used to display the distribution of a single variable.

A frequency table is used to display the distribution of a variable.

Imagine you find an unexpected but statistically significant result in your data. Which of the following courses of action makes the most sense?

Restriction of range is likely to be a problem in which of the following studies?

Which of the following is most clearly a statement about a statistical relationship between variables?

Which of the following pairs of variables seems most likely to have a negative relationship?

A Cohen's d of 1.00 means that two group means differ by one standard deviation.

Raw data are data that have not yet been analyzed.

The standard deviation is one half the range.

Explain why the median is sometimes a better measure of central tendency than the mean.

The median is the most common score in a distribution.

Explain what Pearson's r is for someone who is not already familiar with statistics.

A Pearson's r of -.45 represents a stronger relationship than a Pearson's r of +.37.

In a positively skewed distribution, the mean is greater than the median.

The variance is the square root of the standard deviation.

The Science of Psychology

Getting Started in Research

Research Ethics

Theory in Psychology

Psychological Measurement

Experimental Research

Nonexperimental Research

Complex Research Designs

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Presenting Your Research

Inferential Statistics

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Exam 12: Descriptive Statistics

It is impossible to say what the results of a study are until the inferential statistics have been done.

Why should researchers be cautious about unexpected results in their data-even when those results are statistically significant?

In a positively skewed distribution, which of the following is true?

Research has shown that men have stronger leadership abilities than women.

Pearson's r is the mean cross-product of two sets of z scores.

A histogram is used to display the distribution of a single variable.

A frequency table is used to display the distribution of a variable.

Imagine you find an unexpected but statistically significant result in your data. Which of the following courses of action makes the most sense?

Restriction of range is likely to be a problem in which of the following studies?

Which of the following is most clearly a statement about a statistical relationship between variables?

Which of the following pairs of variables seems most likely to have a negative relationship?

A Cohen's d of 1.00 means that two group means differ by one standard deviation.

Raw data are data that have not yet been analyzed.

The standard deviation is one half the range.

Explain why the median is sometimes a better measure of central tendency than the mean.

The median is the most common score in a distribution.

Explain what Pearson's r is for someone who is not already familiar with statistics.

A Pearson's r of -.45 represents a stronger relationship than a Pearson's r of +.37.

In a positively skewed distribution, the mean is greater than the median.

The variance is the square root of the standard deviation.

The Science of Psychology

Getting Started in Research

Research Ethics

Theory in Psychology

Psychological Measurement

Experimental Research

Nonexperimental Research

Complex Research Designs

Survey Research

Single-Subject Research

Presenting Your Research

Inferential Statistics

Filters